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OI-codes/Luogu/P3717/P3717.cpp

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#include <bits/stdc++.h>
using namespace std;
bool vis[105][105];
int main() {
int n, m, r, x, y, ans = 0;
cin >> n >> m >> r;
for (int i = 0; i < m; i++) {
cin >> x >> y;
for (int j = 1; j <= n; j++) {
for (int k = 1; k <= n; k++) {
if (sqrt((x - j) * (x - j) + (y - k) * (y - k)) <= r) {
vis[j][k] = 1;
}
}
}
}
for(int i = 1 ; i <= n ; i++) {
for(int j = 1 ; j <= n ; j++) {
if(vis[i][j]) {
ans++;
}
}
}
cout << ans << endl;
return 0;
}