Submission #745793

#	Time	Username	Problem	Language	Result	Execution time	Memory
745793		vjudge1	Fancy Fence (CEOI20_fancyfence)	C++14	12 / 100	1077 ms	296 KiB

fancyfence

#include <bits/stdc++.h>
using namespace std;

#define int long long

const int MOD = 1e9 +7;

int binpow(int a, int b){
    int ans = 1;
    while(b != 0){
        if(b & 1){
            ans = ans * a % MOD;
        }
        a = a * a % MOD;
        b /= 2;
    }
    return ans;
}

signed main() {
    int n;
    cin >> n;
    vector<int> h(n), w(n);
    int cnt = 0;
    for(int i = 0; i < n; i++){
        cin >> h[i];
    }
    for(int i = 0; i < n; i++){
        cin >> w[i];
    }
    int dv = binpow(2, MOD - 2);
    int ans = 0;
    for(int i = 0; i < n; i++){
        for(int j = 1; j <= h[i]; j++){
            int k = i;
            while(k < n - 1 && h[k + 1] >= j){
                k++;
            }
            k = k - i + 1;
            ans = (ans + j * k) % MOD;
        }
    }
    cout << ans << endl;
    return 0;
}

Compilation message (stderr)

fancyfence.cpp: In function 'int main()':
fancyfence.cpp:24:9: warning: unused variable 'cnt' [-Wunused-variable]
   24 |     int cnt = 0;
      |         ^~~
fancyfence.cpp:31:9: warning: unused variable 'dv' [-Wunused-variable]
   31 |     int dv = binpow(2, MOD - 2);
      |         ^~

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