Submission #3116138

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Source Code Expand

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

#define pb push_back
#define fo(i, n) for(int i = 1; i <= n; ++i)

const int mod = 1e9 + 7;
const int N = 400012;
const int inf = 2e9;

int main() {
    ios::sync_with_stdio(0); cin.tie(0);
    int n, k;
    ll ans = 0;
    cin >> n >> k;
    for(int i = 0; i < k; ++i) {
        int cnt = 0;
        for(int j = (i == 0 ? i + k : i); j <= n; j += k) {
            ++cnt;
        }
        if(i * 2 % k == 0) ans += cnt *1ll* cnt *1ll* cnt;
    }

    cout << ans;
    return 0;
}

Submission Info

Judge Result