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Submission #922039

# Submission time Handle Problem Language Result Execution time Memory
922039 2024-02-04T20:44:06 Z Alebn Fancy Fence (CEOI20_fancyfence) C++14
0 / 100
 17 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);
    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) - f(minH, sumW - w[j]) - f(minH, sumW - w[i]) + f(minH, sumW - w[i] - w[j])) % MOD;
            if(res < 0) res += MOD;
        }
    }
    cout << res << "\n";
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Incorrect 15 ms 344 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 356 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Incorrect 14 ms 344 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 15 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Incorrect 15 ms 464 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Incorrect 17 ms 600 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Incorrect 15 ms 344 KB Output isn't correct
3 Halted 0 ms 0 KB -