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class `find-minimum-in-rotated-sorted-array` { | ||
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/** | ||
* TC: O(log N), SC: O(1) | ||
*/ | ||
fun findMin(nums: IntArray): Int { | ||
var (low, high) = 0 to nums.size - 1 | ||
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while (low + 1 < high) { | ||
val mid = (low + high) / 2 | ||
if (nums[mid - 1] > nums[mid]) { | ||
return nums[mid] | ||
} | ||
if (nums[mid] < nums[high]) { | ||
high = mid | ||
} | ||
else { | ||
low = mid | ||
} | ||
} | ||
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return min(nums[low], nums[high]) | ||
} | ||
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@Test | ||
fun `입력받은 정수 배열의 최소 원소를 반환한다`() { | ||
findMin(intArrayOf(4,5,6,7,0,1,2)) shouldBe 0 | ||
findMin(intArrayOf(2,3,0,1)) shouldBe 0 | ||
findMin(intArrayOf(2,3,1)) shouldBe 1 | ||
findMin(intArrayOf(2,1,3)) shouldBe 1 | ||
findMin(intArrayOf(2,3,4,5,1)) shouldBe 1 | ||
findMin(intArrayOf(11,13,15,17)) shouldBe 11 | ||
} | ||
} |