hdu 5567 sequence1（水）

代码

#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <algorithm>

using namespace std;
const int maxn = 105;

int main () {
int n, a[maxn], b, c;
while (scanf("%d%d%d", &n, &b, &c) == 3) {
for (int i = 0; i < n; i++) scanf("%d", &a[i]);
int ans = 0;
for (int i = 0; i < n; i++)
for (int j = i + 1; j < n; j++)
if (abs(a[i] - a[j]) % b == c) ans++;
printf("%d\n", ans);
}
return 0;
}