noi.html

<script type="x" id="ch0103/01">
  var a = Number(prompt())
  var b = Number(prompt())

  alert(a + b)
</script>

<script type="x" id="ch0103/02">
  var a = Number(prompt())
  var b = Number(prompt())
  var c = Number(prompt())

  alert((a + b) * c)
</script>

<script type="x" id="ch0103/03">
  var a = Number(prompt())
  var b = Number(prompt())
  var c = Number(prompt())

  alert( parseInt((a + b) / c))
</script>

<script type="x" id="ch0103/04">
  var a = Number(prompt())
  var b = Number(prompt())

  console.log(parseInt(a/b) , (a%b))
</script>

<script type="x" id="ch0103/05">
  var a = Number(prompt())
  var b = Number(prompt())

  alert((a/b).toFixed(9))
</script>

<script type="x" id="ch0103/06">
  var a = Number(prompt())
  var b = Number(prompt())

  console.log((b * 100/a).toFixed(3) + "%")
</script>

<script type="x" id="ch0103/07">
  var x = Number(prompt())
  var a = Number(prompt())
  var b = Number(prompt())
  var c = Number(prompt())
  var d = Number(prompt())
  alert((a * (x**3) + b * (x * x) + c * x + d).toFixed(7))
</script>

<script type="x" id="ch0103/08">
  var a = Number(prompt())

  alert((5 * (a - 32)/9).toFixed(5))
</script>

<script type="x" id="ch0103/09">
  var r = Number(prompt('输入半径'))
  var pi = 3.14159

  console.log((2 * r).toFixed(4),(2 * pi * r).toFixed(4),(pi * r * r).toFixed(4))
</script>

<script type="x" id="ch0103/10">
  var a = Number(prompt())
  var b = Number(prompt())

  alert((1/(1/a + 1/b)).toFixed(2))
</script>

<script type="x" id="ch0103/11">
  var a = Number(prompt())
  var b = Number(prompt())

  alert((a - parseInt(a/b)*b).toFixed(4))
</script>

<script type="x" id="ch0103/12">
  var a = Number(prompt())

  alert((4/3*(Math.PI).toFixed(2)*(a**3)).toFixed(2))
</script>456

<script type="x" id="ch0103/13">
  var a = Number(prompt())
  var x,y,z
  x = parseInt(a % 10) //个位数
  y = parseInt((a % 100) / 10) //十位数
  z = Math.floor(a/100)//百位数
  console.log(x.toString()+y.toString()+z.toString())
</script>

<script type="x" id="ch0103/14">
  var a = Number(prompt())
  var b = Number(prompt())

  alert( Math.ceil(20000/(3.14*(b*b)*a)))
</script>

<script type="x" id="ch0103/15">
  var a = Number(prompt())
  var b = Number(prompt())
  var c = Number(prompt())

  alert(a - Math.ceil(c/b))
</script>

<script type="x" id="ch0103/16">
  var a = Number(prompt())
  var b = Number(prompt())
  var c = Number(prompt())
  var d = Number(prompt())

  alert((Math.sqrt((c-a)*(c-a) + (d-b)*(d-b))).toFixed(3))
</script>

<script type="x" id="ch0103/17">
  var x1 = Number(prompt())
  var y1 = Number(prompt())
  var x2 = Number(prompt())
  var y2 = Number(prompt())
  var x3 = Number(prompt())
  var y3 = Number(prompt())

  var a = Math.sqrt( (x2-x1)*(x2-x1) + (y2-y1)*(y2-y1) )
  var b = Math.sqrt( (x3-x1)*(x3-x1) + (y3-y1)*(y3-y1) )
  var c = Math.sqrt( (x2-x3)*(x2-x3) + (y2-y3)*(y2-y3) )
  var p = (a + b +c) / 2 //半周长

  alert((Math.sqrt( p*( p - a )*( p - b )*( p - c ) )).toFixed(2))
</script>

<script type="x" id="ch0103/18">
  var a1 = Number(prompt())
  var a2 = Number(prompt())
  var n  = Number(prompt())

  alert(a1 + (n-1) * (a2 - a1))
</script>

<script type="x" id="ch0103/19">
  var a = Number(prompt())
  var b = Number(prompt())

  alert(a * b)
</script>

<script type="x" id="ch0103/20">
  var n = Number(prompt())

  alert(2**n)
</script>

<!-- NOI-104 编程基础之逻辑表达式与条件分支 -->

<script type="x" id="ch0104/01">
  var N = Number(prompt('输入一个正整数'))

  if (N > 0) {
    console.log('positive')
  }else if(N = 0) {
    console.log('zero')
  }else {
    console.log('negative')
  }

</script>

<script type="x" id="ch0104/02">
  var N = Number(prompt('输入一个浮点数'))

  console.log(Math.abs(N))
</script>

<script type="x" id="ch0104/03">
  var N = Number(prompt('输入一个正整数'))

  if (N % 2 == 0) {
    console.log('even')
  }else  {
    console.log('odd')
  }
    
</script>

<script type="x" id="ch0104/04">
  var N = prompt('输入一个正整数')
  var NASCII = N.charCodeAt(0)

  if (NASCII % 2 == 0) {
    console.log('NO')
  }else {
    console.log('YES')
  }
  
</script>

<script type="x" id="ch0104/05">
  var x = Number(prompt('输入一个正整数'))
  var y = Number(prompt('输入一个正整数'))

  if (x > y) {
    console.log('>')
  }else if(x = y) {
    console.log('=')
  }else {
    console.log('<')
  }
    
</script>

<script type="x" id="ch0104/06">
  var N = Number(prompt('输入一个正整数'))

  if (N >= 10 && N <= 99) {
    console.log('1')
  }else {
    console.log('0')
  }
  
</script>

<script type="x" id="ch0104/07">
  var lucky = Number(prompt('幸运数量'))
  var con = Number(prompt('鼓励数量')) 

  if (lucky >= 10 || con >= 20) {
    console.log('1')
  }else {
    console.log('0')
  }
  
</script>

<script type="x" id="ch0104/08">
  var N = Number(prompt('输入一个正整数'))

  if (N % 3 == 0 && N % 5 == 0) {
    console.log('YES')
  }else {
    console.log('NO')
  }
  
</script>

<script type="x" id="ch0104/09">
  var N = Number(prompt('输入一个正整数'))

  if (N % 3 == 0 && N % 5 == 0 && N % 7 == 0) {
    console.log('3 5 7')
  }else if(N % 3 == 0 && N % 5 == 0 && N % 7 != 0) {
    console.log('3 5')
  }else if(N % 3 == 0 && N % 7 == 0 && N % 5 != 0){
    console.log('3 7')
  }else if(N % 5 == 0 && N % 7 == 0 && N % 3 != 0){
    console.log('5 7')
  }else if(N % 3 == 0 && N % 5 != 0 && N % 7 != 0){
    console.log('3')
  }else if(N % 3 != 0 && N % 5 == 0 && N % 7 != 0){
    console.log('5')
  }else if(N % 3 != 0 && N % 5 != 0 && N % 7 == 0){
    console.log('7')
  }else if(N % 3 != 0 && N % 5 != 0 && N % 7 != 0){
    console.log('n')
  }
  
</script>

<script type="x" id="ch0104/10">
  var N = Number(prompt('输入数学成绩'))
  var M = Number(prompt('输入语文成绩'))

  if (N < 60 || M < 60) {
    console.log('1')
  }else {
    console.log('0')
  }
  
  
</script>

<script type="x" id="ch0104/11">
  var N = Number(prompt('去看展览的日期'))
  
  if (N == 1 || N == 3 || N == 5) {
  console.log('NO')
  }else {
  console.log('YES')
  }
</script>

<script type="x" id="ch0104/12">
  var N = Number(prompt('一次办事要行走的距离'))
  
  if ((50 + N / 3) > (N / 1.2)) {
  console.log('Walk')
  }else if((50 + N / 3) == (N / 1.2)) {
  console.log('All')
  }else {
    console.log('Bike')
  }
  
</script>

<script type="x" id="ch0104/13">
  var x = Number(prompt('一个浮点数'))
  var y = 0
  if (x >= 0 && x < 5) {
  y = -x + 2.5
  }else if(x >= 5 && x < 10) {
  y = 2 - 1.5*(x-3)*(x-3)
  }else if(x >= 10 && x < 20) {
  y = x / 2 - 1.5
  }

  console.log(y.toFixed(3))
  
</script>

<script type="x" id="ch0104/14">
  var x = Number(prompt('输入邮件重量'))
  var i = prompt('是否加急')
  var s = 0

  if(x < 1000) {
    s = 8
  }else{
    s = 8 + Math.ceil((x - 1000) / 500) * 4
  }
  if (i == 'n') {
    s = s 
  }else if(i == 'y'){
    s = s + 5
  }
  
  console.log(s)
</script>

<script type="x" id="ch0104/15">
  var x = Number(prompt('输入一个数'))
  var y = Number(prompt('输入一个数'))
  var z = Number(prompt('输入一个数'))
  var max 

  if (x > y && x > z) {
    max = x
  }else if(y > x && y > z) {
    max = y
  }else if(z > x && z > y) {
    max = z
  }

  console.log(max)

</script>

<script type="x" id="ch0104/16">
  var x = Number(prompt('输入一个数'))
  var y = Number(prompt('输入一个数'))
  var z = Number(prompt('输入一个数')) 

  if (x + y > z || x + z > y || y + z > x) {
    console.log('yes')
  }else {
    console.log('no')
  }

</script>

<script type="x" id="ch0104/17">
  var year = Number(prompt('输入年份'))
  
  if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
    console.log('Y')
  }else {
    console.log('N')
  }
</script>

<script type="x" id="ch0104/18">
  var x = Number(prompt('输入x坐标'))
  var y = Number(prompt('输入y坐标'))
  
  if ((x >= -1 && x <= 1) && (y >= -1 && y <= 1)) {
    console.log('yes')
  }else {
    console.log('no')
  }
</script>

<script type="x" id="ch0104/19">
  var a = Number(prompt())
  var b = Number(prompt())
  var op = prompt()

  if (op == '+') {
    console.log(a + b)
  } else if (op == '-') {
    console.log(a - b)
  } else if (op == '*') {
    console.log(a * b)
  } else if (op == '/') {
    if (b == 0) {
      console.log('Divided by zero!')
    } else {
      console.log(a / b)
    }
  } else {
    console.log('Invalid operator!')
  }
  
</script>

<script type="x" id="ch0104/20">
  var a = Number(prompt())
  var b = Number(prompt())
  var c = Number(prompt())

  var delta = b * b - 4 * a * c
  var delta = b * b - 4 * a * c

  if (delta >= 0) {
    var x1 = (-b + Math.sqrt(delta)) / (2 * a)
    var x2 = (-b - Math.sqrt(delta)) / (2 * a)

    if (delta > 0) {
      var result = 'x1=' + x1.toFixed(5) + ';x2=' + x2.toFixed(5)
    } else {
      var result = 'x1=x2=' + x1.toFixed(5)
    }
  } else {
    delta = -delta
    var sDelta = Math.sqrt(delta)

    var x1real = -b / (2 * a) // x1的实部
    var x1imag = sDelta / (2 * a)// x1的虚部
    var x2real = -b / (2 * a) // x1的实部
    var x2imag = -sDelta / (2 * a)// x1的虚部

    var x1 = x1real.toFixed(5) + (x1imag > 0 ? '+' : '') + x1imag.toFixed(5) + 'i'
    var x2 = x2real.toFixed(5) + (x2imag > 0 ? '+' : '') + x2imag.toFixed(5) + 'i'

    var result = 'x1=' + x1 + ';x2=' + x2
  }
  console.log(result)
</script>

<script type="x" id="ch0104/21">
  var n = Number(prompt('苹果数量'))
  var x = Number(prompt('x小时能吃完一个苹果'))
  var y = Number(prompt('y小时后还有几个苹果'))
  var s

  if (y /x >= n) {
    console.log('0')
  }else if(y / x < n) {
    s = n - Math.ceil(y / x)
    console.log(s)
  }
</script>


<!-- NOI-105 编程基础之循环控制 -->

<script type="x" id="ch0105/01">

  var n = Number(prompt()) //学生个数
  var totalAge = 0 
  for (let index = 1; index <= n; index++) {
    var age = Number(prompt('请输入第' + index + '人的年龄'))
    totalAge = totalAge + age
  }
  var average = totalAge / n
  console.log(average.toFixed(2))

</script>

<script type="x" id="ch0105/02">
  var totaljieyu = 0
  for (let index = 1; index <= 12; index++) {
    var jieyu = Number(prompt('请输入第' +  index + '月的结余'))
    totaljieyu = totaljieyu + jieyu
  }
  var average = (totaljieyu / 12).toFixed(2)
  console.log('$' + average)
</script>

<script type="x" id="ch0105/03">
  var n = Number(prompt('请输入样本容量')) 
  var s = 0
  for (let index = 1; index <= n; index++) {
    var number = Number(prompt('输入第' + index + '个数')) 
    s = s + number
  }
  var average = (s / n).toFixed(4)
  console.log(average)

</script>

<script type="x" id="ch0105/04">
  var n = Number(prompt('请输入样本容量')) 
  var s = 0 //和
  var a = 0 //平均值
  for (let index = 0; index < n; index++) {
    var t = Number(prompt('第' + index + '个数')) 
    s = s + t
  }
  a = s / n
  console.log(s)
  console.log(a.toFixed(5))
</script>

<script type="x" id="ch0105/05">
  var n = Number(prompt('请输入样本容量')) 
  var max = 0 //最大值
  
  for (let index = 0; index < n; index++) {
    var t = Number(prompt('第' + index + '个学生的成绩'))
    if (t > max) {
      max = t
    }
  }
  console.log(max)
</script>

<script type="x" id="ch0105/06">
  var n = Number(prompt('请输入序列长度')) 
  var max = 1
  var min = 1000

  for (let index = 0; index < n; index++) {
    var t = Number(prompt('请输入序列的第' + index + '个数'))
    if(t > max) {
      max = t
    }
    if(t < min) {
      min = t
    }
  }
  console.log(max - min)
</script>

<script type="x" id="ch0105/07">

  var n = Number(prompt('请输入参加的天数'))
  var Sgold = 0
  var Ssilver = 0
  var Scopper = 0
  for (let index = 1; index <= n; index++) {
    var gold = Number(prompt('输入第' + index + '天得到的金牌数'))
    var silver = Number(prompt('输入第' + index + '天得到的银牌数'))
    var copper = Number(prompt('输入第' + index + '天得到的铜牌数'))
    
    Sgold = Sgold + gold
    Ssilver = Ssilver + silver
    Scopper = Scopper + copper 
    S = Sgold + Ssilver + Scopper
  }
  console.log(Sgold,Ssilver,Scopper,S)
</script>

<script type="x" id="ch0105/08">
  var n = Number(prompt('多边形为几边形'))
  var t = 0 //已知内角的和
  var r = 0 //剩下的内角度数

  for (let index = 1; index < n; index++) {
    var l = Number(prompt('输入第' + index + '个内角的度数'))
    t = t + l
  }
  console.log((n-2) * 180 - t )
</script>

<script type="x" id="ch0105/09">
  var m = Number(prompt('请输入m'))
  var n = Number(prompt('请输入n'))
  var t = m  //遍历指针
  var end = 0
  for (let index = 0; index < n-m+1; index++) {
    if (t % 2 === 1) {
      end = end + t
    }
    t = t + 1
  }
  console.log(end)
</script>

<script type="x" id="ch0105/10">
  var m = Number(prompt('请输入m'))
  var n = Number(prompt('请输入n'))
  var t = m  //遍历指针
  var end = 0
  for (let index = 0; index < n-m+1; index++) {
    if (t % 17 === 0) {
      end = end + t
    }
    t = t + 1
  }
  console.log(end)
</script>

<script type="x" id="ch0105/11">
  var k = Number(prompt('有多少个正整数')) //k个数
  var k1 = 0 
  var k5 = 0
  var k10 = 0
  for (let index = 0; index < k; index++) {
    var s = Number(prompt('输入的第' + index + '个数'))
    if(s === 1) {
      k1 = k1 + 1 
    }
    if (s === 5) {
      k5 = k5 + 1 
    }
    if (s === 10) {
      k10 = k10 +1 
    }
  }
  console.log(k1,k5,k10)
</script>

<script type="x" id="ch0105/12">

  var N = Number(prompt('整数序列的长度'))
  var m = Number(prompt('指定的数字')) 
  var end = 0 //相同的个数

  for (let index = 0; index < N; index++) {
    var x = Number(prompt('输入第' + index + '个数'))
    if (x === m) {
      end++
    }
  }

  console.log(end)
</script>

<script type="x" id="ch0105/13">
  var a = Number(prompt('输入整数'))
  var n = Number(prompt('几次幂')) 
  
  console.log(a ** n)
</script>

<script type="x" id="ch0105/14">
  var x = Number(prompt('人口数'))
  var n = Number(prompt('年数'))
  
  for (let index = 0; index < n; index++) {
    x = x * 1.001
  }
  console.log(x.toFixed(4))
</script>

<script type="x" id="ch0105/15">
  var rate = Number(prompt())
  var money = Number(prompt())
  var year = Number(prompt())

  var ratio = (1 + rate / 100)

  for (var i = 0; i < year; i++) {
    money = money * ratio
  }

  console.log(Math.floor(money))
</script>

<script type="x" id="ch0105/16">
  var n = Number(prompt())

  var result = (1 / Math.sqrt(5)) * (((1 + Math.sqrt(5)) / 2) ** n - ((1 - Math.sqrt(5)) / 2) ** n )

  console.log(result)
</script>

<script type="x" id="ch0105/17">

  var n = Number(prompt())

  var a = 0
  var b = 1
  var c

  for (var i = 0; i < n; i++) {
    c = a + b
    a = b
    b = c
  }

  console.log(a)

</script>

<script type="x" id="ch0105/18">
  var n = Number(prompt())

  var baseTotal = Number(prompt())
  var baseEffect = Number(prompt())

  var baseEffectRatio = baseEffect / baseTotal * 100

  for (var i = 1; i < n; i++) {
    var total = Number(prompt())
    var effect = Number(prompt())
    var ratio = effect / total * 100

    if (ratio - baseEffectRatio > 5) {
      console.log('better')
    } else if (baseEffectRatio - ratio > 5) {
      console.log('worse')
    } else {
      console.log('same')
    }
  }


</script>

<script type="x" id="ch0105/19">
  var n = Number(prompt())

  var totalTime = 0

  for (var i = 0; i < n; i++) {
    var x = Number(prompt())
    var y = Number(prompt())
    var count = Number(prompt())

    var distance = Math.sqrt(x * x + y * y)

    var time = distance / 50 * 2 + count * 1.5

    totalTime += time
  }

  console.log(Math.ceil(totalTime))

</script>

<script type="x" id="ch0105/20">
  var h = Number(prompt())

  var total = 0

  for (var i = 0; i < 1; i++) {
    total += h
    h = h / 2
    total += h
  }

  console.log(total - h, h)
</script>

<script type="x" id="ch0105/21">
  var N = Number(prompt('输入一个正整数'))

  function s(N) {
    if(N == 1){
      console.log('End')
      return 
    }
    if(N % 2 === 1) {
      console.log(N + '*3+1=' + (N * 3 + 1))
      s(N * 3 + 1)
    }
    if(N %2 === 0) {
      console.log(N + '/2=' + (N / 2))
      s(N / 2)
    }
  }

  s(N)
</script>

<script type="x" id="ch0105/22">
  var 手上的钱 = 0
  var 存下的钱 = 0
  var 不够花 = false

  for (var i = 1; i <= 12; i++) {
    手上的钱 += 300
    var 本月预算 = Number(prompt())

    if (手上的钱 < 本月预算) {
      console.log(-i)
      不够花 = true
      break
    } else {
      手上的钱 -= 本月预算
      var 能存下的钱 = 手上的钱 - 手上的钱 % 100
      手上的钱 -= 能存下的钱
      存下的钱 += 能存下的钱
    }
  }

  if (!不够花) {
    console.log(手上的钱 + 存下的钱 * 1.2)
  }
</script>

<script type="x" id="ch0105/23">
  var m = Number(prompt('库存总量'))
  var n = Number(prompt('取药人数'))
  var Nodrug = 0

  for (let index = 0; index < n; index++) {
    var drug = Number(prompt('第' + index + '位病人希望取走的药品数量'))
    if (drug <= m) {
      m = m - drug
    }else {
      Nodrug = Nodrug + 1
    }
  }

  console.log(Nodrug)
</script>

<script type="x" id="ch0105/24">

  var n = Number(prompt('测量次数'))
  var normalhour = 0

  for (let index = 0; index < n; index++) {
    var syspre = Number(prompt('第' + index + '次收缩压'))
    var diapre = Number(prompt('第' + index + '次舒张压'))

    if ((syspre >= 90 && syspre <= 140) && (diapre >= 60 && diapre <= 90) ) {
      normalhour++
    }else if((syspre < 90 || syspre >140) || (diapre < 60 || diapre > 90)) {
      normalhour--
    }
  }

  console.log(normalhour)
</script>

<script type="x" id="ch0105/25">
  // 81到342之间的数转换成7进制与9进制才都是3位数
  for (var x = 81; x <= 342; x++) {
    var a7 = x % 7 // 7进制个位数
    var b7 = (x - a7) / 7 % 7 // 7进制右数第二位数
    var c7 = (x - a7 - b7 * 7) / 7 / 7 % 7 // 7进制右数第三位数

    var a9 = x % 9 // 9进制个位数
    var b9 = (x - a9) / 9 % 9 // 9进制右数第二位数
    var c9 = (x - a9 - b9 * 9) / 9 / 9 % 9 // 9进制右数第三位数

    if (a7 == c9 && a9 == c7 && b7 == b9) {
      console.log(x)
      console.log('' + c7 + b7 + a7)
      console.log('' + c9 + b9 + a9)
      break
    }
  }
</script>

<script type="x" id="ch0105/26">
  var n = Number(prompt('输入的四位数个数'))
  var end = 0

  for (let index = 0; index < n; index++) {
    var num = Number(prompt('第' + index + '次输入的数'))
    var D = parseInt(num % 10); //个位 
    var A = parseInt((num % 10000) / 1000); //千位
    var B = parseInt((num % 1000) / 100); //百位
    var C = parseInt((num % 100) / 10); //十位

    if ((D - A - B - C) > 0) {
      end++
    }
  }
  console.log(end)
</script>

<script type="x" id="ch0105/27">
  var K = Number(prompt('请输入整数K'))
  var n = 1
  var Sn = 0

  for (let index = 1; ; index++) {
    Sn = Sn + 1 / n
    n++
    if (Sn > K) {
      n--
      break;
    }
  }

  console.log(n)
</script>

<script type="x" id="ch0105/28">
  var n = Number(prompt())

  do {
    var d = n % 10
    console.log(d)
    n = n - d
    n = n / 10
  } while (n > 0)
</script>

<script type="x" id="ch0105/29">
  var n = Number(prompt())
  var sign = 1

  if (n < 0) { // 如果n小于0,把n转成正数,并记录符号
    n = -n
    sign = -1
  }

  var str = ''

  do {
    var d = n % 10 //d = 3
    str = str + d  // str = 3
    n = n - d     // n = 120
    n = n / 10    // n = 12
  } while (n > 0)

  str = parseInt(str, 10)  // '2'

  if (sign == 1) {
    console.log(str)
  } else {
    console.log(-str)
  }
</script>

<script type="x" id="ch0105/30">
  var m = Number(prompt('输入正整数'))
  var k = Number(prompt('输入正整数'))
  var n = m.toString()

  function searchStrEach(str, target) {
   let sum = 0
   for (let key of str) {
      if (key == target) {
         sum ++
      }
   }
   return sum;
 }
  
  if ((searchStrEach(n,'3') == k) && ((m % 19) == 0)) {
    console.log('YES')
  }else {
    console.log('NO')
  }
</script>

<script type="x" id="ch0105/31">
  var n = Number(prompt('一共有几盏灯'))
  var m = Number(prompt('一共有多少人'))
  var r = ''
  进过if = false

  for (var i = 1; i <= n; i++) {
    var open = true
    
    for (var j = 1;j <= m ; j++) {
      if(i % j == 0) {
      open = !open
      }
    }
    if (!open) {
      if (!进过if) {
        进过if = true
        r += i
      }else {
        r += (',' + i)
      }
    }
  }

  console.log(r)
</script>

<script type="x" id="ch0105/32">
  var n = Number(prompt())

  var a = 1
  var b = 2
  var sum = 0

  for (let i = 0; i < n; i++) {
    sum += b / a
    var c = a + b 
    a = b 
    b = c
  }

  console.log(sum.toFixed(4))
</script>

<script type="x" id="ch0105/33">
  var n = Number(prompt('输入一个正整数'))
  var S = 0 //前n项和
  var i = n
  
  for (let index = 0; index < n; index++) {
    var N = ((-1)**(i-1)) * 1 / i //第n项
    i--
    S = S + N
  }

  console.log(S.toFixed(4))

</script>

<script type="x" id="ch0105/34">
  var n = Number(prompt('请输入正整数'))
  var S = 1 //阶乘的和
  var t = n

  function elevator (i) {
    if(i > 0)
    return (i * elevator(i-1))
    else return (1)
  }

  for (let index = 0; index < n; index++) {
    S = S + elevator(t)
    t--
    if (t == 1) {
      break
    }
  }

  console.log(S)
</script>

<script type="x" id="ch0105/35">
  var n = Number(prompt('请输入正整数'))
  var e = 1
  var t = n 

  function elevator (i) {
    if(i > 0)
    return (i * elevator(i-1))
    else return (1)
  }
  function felevator(params) {
    return 1 / params
  }

  for (let index = 0; index < n; index++) {
    e = e + felevator(elevator(t))
    t--
    if (t == 0) {
      break
    }
  }

  console.log(e.toFixed(10))
</script>

<script type="x" id="ch0105/36">
  var x = Number(prompt('请输入底数x'))
  var n = Number(prompt('请输入指数n'))
  var S = 1
  var t = n

  function exp(a,b) {
    return a ** (b)
  }

  for (let index = 0; index < (n+1); index++) {
    S = S + exp(x,t)
    t--
    if (t == 0) {
      break
    }
  }
  console.log(S.toFixed(2))
</script>

<script type="x" id="ch0105/37">
  var m = Number(prompt('请输入雇佣兵体力最大值M'))
  var n = Number(prompt('请输入雇佣兵战斗力N'))
  var x = Number(prompt('请输入雇佣兵能量元素X'))
  var t = 0 //初始体力


  console.log(n)

</script>

<script type="x" id="ch0105/38">
  var n = Number(prompt())

  for (var i = 1; i <= n; i++) {
    var m = Number(prompt()) // 最高次幂
    var M = m // 保存最高次幂

    if (m == 0) { // 最高次幂为0时是特殊情况,因为也要输出1个数
      var c = Number(prompt())
      console.log(0)
    } else {// 其它情况最高次幂是n,输出n-1个数
      for (var j = 0; j <= M; j++) {
        var c = Number(prompt())
        if (j !== M) {
          console.log(c * m)
        }
        m--
      }
    }
  }
</script>

<script type="x" id="ch0105/39">
  var n = Number(prompt('输入一个正整数'))
  var S = 0 
  var j = 0

  for (let i = 0; i < n; i++) {
    if ((i%7) != 0 && (i%10)!= 7 && (i/10)!= 7) {
      j = i * i 
      S = S + j
    }
  }

  console.log(S)
</script>

<script type="x" id="ch0105/40">
  var n = Number(prompt())

  var count = 0

  // 对于1到n的每个数
  for (var i = 1; i <= n; i++) {
    var x = i

    // 将x拆解为其每位上的数
    while(x > 0) {
      var d = x % 10
      if (d == 1) { // 如果是1,则计数加1
        count++
      }
      x = (x - d) / 10
    }
  }

  console.log(count)

</script>

<script type="x" id="ch0105/41">
  var start = Number(prompt())
  var end = Number(prompt())

  var count = 0

  // 对于1到n的每个数
  for (var i = start; i <= end; i++) {
    var x = i

    // 将x拆解为其每位上的数
    while(x > 0) {
      var d = x % 10
      if (d == 2) { // 如果是1,则计数加1
        count++
      }
      x = (x - d) / 10
    }
  }

  console.log(count)
</script>

<script type="x" id="ch0105/42">
  var h = Number(prompt())
  var w = Number(prompt())
  var char = prompt()
  var fill = Number(prompt())

  var result = ''

  // 遍历处理每一行
  for (var i = 0; i < h; i++) {

    // 处理第i行的每个字符
    for (var j = 0; j < w; j++) {
      // 如果处于边缘，则拼指定的符号
      if (i == 0 || j == 0 || i == h - 1 || j == w - 1) {
        result += char
      } else { // 否则，看是否填充
        // 如果填充，就拼指定的符号
        if (fill) {
          result += char
        } else { // 否则就拼空格
          result += ' '
        }
      }
    }
    // 不是最后一行时，才在行尾加上一个回车
    if (i !== h - 1) {
      result += '\n'
    }
  }

  console.log(result)


</script>
<script type="x" id="ch0105/43">
  var n = Number(prompt())
  for (var i = 2; i < n; i++) {
    if (n % i == 0) {
      console.log(n / i)
      break
    }
  }
</script>

<script type="x" id="ch0105/44">
  var n = Number(prompt())

  var count = 0

  for (var i = 2; ; i++) {
    var i是素数 = true // 先假设i是素数，因为此时还不知道i是否有因子

    // 尝试寻找i是否有因子，一旦找到，说明i不是素数
    for (var j = 2; j < i; j++) { // 拿j遍历从2到i-1
      if (i % j == 0) {
        i是素数 = false
        break // 一旦找到任意一个能整除i的数，则i可以确定i不是素数了，也不用继续循环了
      }
    }

    if (i是素数) {
      count++ // 对遇到的素数进行计数
      if (count == n) { // 如果是第n个，则输出并结束
        console.log(i)
        break
      }
    }
  }

</script>

<script type="x" id="ch0105/45">
  var n = Number(prompt())

  var sum = 0 // 记录总的金币数量
  var coins = 1 // 当前时段发的金币数量
  var days = 0 // 当前面额的金币发了多少天

  // 遍历每一天，为了确保循环体内的逻辑运行n次
  for (var i = 1; i <= n; i++) {
    sum += coins // 今天发coins枚金币
    days++ // 发一次就记一天

    // 如果当前面额的金币发的天数跟金币面额一样
    if (days === coins) {
      coins++ // 金币面额加1
      days = 0 // 新的面额天数归零
    }
  }

  console.log(sum)
</script>


<!-- fuucntion -->

<script id="narcissistic">
  //获取位数
  function digitWidth(n) {
    var w = 0
    //看这个数能除以10除多少次
    do {
      var ge = n % 10
      w++
      n = (n - ge) / 10
    } while (n > 0)

    return w
  }

  function narcissistic(n) {
    var width = digitWidth(n)
    var sum = 0
    var m = n

    while (n > 0) {
      var ge = n % 10
      sum += Math.pow(ge, width)
      n = (n - ge) / 10
    }

    if (sum === m) {
      return 'YES'
    } else {
      return 'NO'
    }
  }

  narcissistic(122)

</script>

<script id="narcissistics">

  function digitWidth(n) {
    var w = 0
    //看这个数能除以10除多少次
    do {
      var ge = n % 10
      w++
      n = (n - ge) / 10
    } while (n > 0)

    return w
  }

  function narcissistic(n) {
    var width = digitWidth(n)
    var sum = 0
    var m = n

    while (n > 0) {
      var ge = n % 10
      sum += Math.pow(ge, width)
      n = (n - ge) / 10
    }

    if (sum === m) {
      return true
    } else {
      return false
    }
  }

  for (let i = 100; i < 1000; i++) {
    if (narcissistic(i)) {
      console.log(i)
    }
  }
</script>

<script id="palindrom">
  function isPalindrom(n) {
    var str = ''

    var m = n
    do {
      var ge = n % 10
      str += ge
      n = (n - ge) / 10
    } while (n > 0)

    if (Number(str) == m) {
      return true
    } else {
      return false
    }
  }

  isPalindrom(112233)
  isPalindrom(1125251)
</script>

<script id="sqrt">
  function sqrt(n) {
    var low = 0
    var high = Math.max(n, 2)

    while (high - low > 0.000000001) { //上限下限基本相同时 跳出循环
      var middle = (low + high) / 2
      if (middle * middle > n) {
        high = middle
      } else if (middle * middle < n) {
        low = middle
      } else if (middle * middle == n)
        return middle.toFixed(3)
    }

    return Number(((high + low) / 2).toFixed(3))
  }
</script>


<script id="weekday">

</script>

<script>

  function pow(a, n) {
    if (n = 0) {
      return 1
    } else {
      return pow(a, n - 1) * a
    }
  }


  function fibb(n) {
    if (n == 1 || n == 2) {
      return 1
    } else {
      return fibb(n - 1) + fibb(n - 2)
    }
  }



</script>


<script>
  debugger
  function aweb(n) {
    var a = 3
    return function bweb(s) {
      var b = 2
      return b * b * s * a
    }
  }

  p1 = aweb(2)
  p2 = aweb(3)
  console.log(p1(5))
</script>

<script>
  var target = 24
  function find(start, history) {
    if (start < target) {
      var a = start * 3
      var ah = '(' + history + ') * 3'
      find(a, ah)

      var b = start + 5
      var bh = '(' + history + ') + 5'
      find(b, bh)
    }else if (start > target) { return }
    else {
      console.log(history)
      return
    }

  }
</script>