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Submission #921729

# Submission time Handle Problem Language Result Execution time Memory
921729 2024-02-04T09:36:02 Z Alebn Fancy Fence (CEOI20_fancyfence) C++14
0 / 100
 1 ms 600 KB 
#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), suffixWSum(n);
    for(int i = 0; i < n; i++) cin >> h[i];
    for(int i = 0; i < n; i++) cin >> w[i];
    for(int i = n-1; i > -1; i--) suffixWSum[i] = (w[i] + (i == n-1 ? 0 : suffixWSum[i+1])) % MOD;
    //linearily go over and compute result
    int res = 0;
    for(int i = 0; i < n; i++) {
        res = (res + f(h[i], suffixWSum[i])) % MOD;
        if(i != 0) res = (res - f(h[i-1], suffixWSum[i])) % MOD;
        if(res < 0) res = (res + MOD) % MOD;
    }
    res = (res + f(h[n-1], suffixWSum[n-1])) % MOD;
    if(n > 1) res = (res - f(h[n-2], suffixWSum[n-2])) % MOD;
    if(res < 0) res = (res + MOD) % MOD;
    cout << res << "\n";
}

Subtask #1
0 / 0.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 440 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 600 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 27.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 440 KB Output isn't correct
2 Halted 0 ms 0 KB -