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OI-codes/Luogu/P2074/P2074.cpp

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2020-11-18 11:16:44 +00:00
#include <bits/stdc++.h>
using namespace std;
int n, m, k, t, x, y, ans, sum;
int main() {
cin >> n >> m >> k >> t;
for (int i = 0; i < k; i++) {
sum = 0;
cin >> x >> y;
for (int i = max(1, x - t); i <= min(n, x + t); i++) {
for (int j = max(1, y - t); j <= min(m, y + t); j++) {
if (sqrt((x - i) * (x - i) + (y - j) * (y - j)) <= t) {
sum++;
}
}
}
ans = max(ans, sum);
}
cout << ans << endl;
return 0;
}