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P1789.cpp
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P1789.cpp
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#include <bits/stdc++.h>
using namespace std;
int a[101][101];
int main()
{
int n, m, k;
cin >> n >> m >> k;
for (int j = 0; j < m; j++)
{
int x, y;
cin >> x >> y;
x--;
y--;
if (x - 2 >= 0)
a[x - 2][y] = 1;
for (int i = y - 1; i <= y + 1; i++)
{
if (x - 1 >= 0 && i >= 0 && i < n)
a[x - 1][i] = 1;
}
for (int i = y - 2; i <= y + 2; i++)
{
if (i >= 0 && i < n)
{
a[x][i] = 1;
}
}
for (int i = y - 1; i <= y + 1; i++)
{
if (x + 1 < n && i >= 0 && i < n)
a[x + 1][i] = 1;
}
if (x + 2 < n)
a[x + 2][y] = 1;
}
for (int i = 0; i < k; i++)
{
int o, p;
cin >> o >> p;
o--;
p--;
for (int j = o - 2; j <= o + 2; j++)
{
for (int z = p - 2; z <= p + 2; z++)
{
if (j >= 0 && j < n && z >= 0 && z < n)
{
a[j][z] = 1;
}
}
}
}
int count = 0;
for (int i = 0; i < n; i++)
{
for (int j = 0; j < n; j++)
{
//cout<<a[i][j]<<' ';
if (a[i][j] == 0)
count++;
}
//cout<<endl;
}
cout << count;
}