Submission #372241

#	Time	Username	Problem	Language	Result	Execution time	Memory
372241		gustason	Travels (LMIO17_keliones)	C++14	45 / 100	104 ms	25564 KiB

keliones

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define int ll
const int mod = 1e9 + 7;
signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, m;
    cin >> n >> m;
    vector<int> add(n);
    for(int i = 0; i < n; i++) {
        cin >> add[i];
    }

    bool adj[n][n];
    for(int i = 0; i < n; i++) {
        for(int j = i+1; j < n; j++) {
            adj[i][j] = true;
        }
    }
    for(int i = 0; i < m; i++) {
        int a, b;
        cin >> a >> b;
        a--, b--;
        adj[a][b] = false;
    }

    vector<ll> cnt(n, 0), sum(n, 0);
    for(int i = 0; i < n; i++) {
        cnt[i] %= mod;
        ll cnts = (cnt[i] * add[i]) % mod;
        sum[i] += cnts;
        for(int j = i+1; j < n; j++) {
            if (!adj[i][j]) continue;
            cnt[j] += (cnt[i] + 1);
            cnt[j] %= mod;
            sum[j] += (sum[i] + add[i]);
            sum[j] %= mod;
        }
    }

    ll ans = 0;
    for(int i = 0; i < n; i++) {
        ans += sum[i];
        ans %= mod;
    }
    cout << ans;
    return 0;
}

• Subtask 1: 8 / 8
• Subtask 2: 12 / 12
• Subtask 3: 25 / 25
• Subtask 4: 0 / 55