Submission #922040

#	Time	Username	Problem	Language	Result	Execution time	Memory
922040		Alebn	Fancy Fence (CEOI20_fancyfence)	C++14	0 / 100	16 ms	448 KiB

fancyfence

#include <bits/stdc++.h>
#define int long long
 
using namespace std;
 
const int MOD = 1e9+7, INV = 250000002;
 
int f(int n, int m) {
    return n * m % MOD * (n + 1) % MOD * (m + 1) % MOD * INV % MOD;
}
 
signed main() {
    //input and sum
    int n;
    cin >> n;
    vector<int> h(n), w(n);
    for(int i = 0; i < n; i++) cin >> h[i];
    for(int i = 0; i < n; i++) cin >> w[i];
    //linearily go over and compute result
    int res = 0;
    for(int i = 0; i < n; i++) {
        int minH = h[i], sumW = w[i];
        res = (res + f(minH, sumW)) % MOD;
        for(int j = i+1; j < n; j++) {
            minH = min(minH, h[i]), sumW += w[j];
            res = (((((res + f(minH, sumW)) % MOD - f(minH, sumW - w[j])) % MOD - f(minH, sumW - w[i])) % MOD + f(minH, sumW - w[i] - w[j]))) % MOD;
            if(res < 0) res += MOD;
        }
    }
    cout << res << "\n";
}

• Subtask 1: 0 / 0
• Subtask 2: 0 / 12
• Subtask 3: 0 / 13
• Subtask 4: 0 / 15
• Subtask 5: 0 / 15
• Subtask 6: 0 / 18
• Subtask 7: 0 / 27