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Submission #577522

# Submission time Handle Problem Language Result Execution time Memory
577522 2022-06-15T03:45:38 Z tengiz05 Fancy Fence (CEOI20_fancyfence) C++17
0 / 100
 3 ms 340 KB 
#include <bits/stdc++.h>

using namespace std;
using i64 = long long;

constexpr int P = 1E9 + 7, D = (P + 1) / 2;

i64 norm(i64 x) {
    if (x < 0)
        x += P;
    else if (x >= P)
        x -= P;
    return x;
}

i64 C(i64 x) {
    x = norm(x);
    return x * (x + 1) % P * D % P;
}

int main() {
    freopen("input1.txt", "r", stdin);
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int n;
    cin >> n;
    
    vector<i64> h(n + 1), w(n + 1);
    for (int i = 1; i <= n; i++) {
        cin >> h[i];
    }
    for (int i = 1; i <= n; i++) {
        cin >> w[i];
        w[i] += w[i - 1];
        w[i] %= P;
    }
    
    vector<i64> s{0};
    i64 sum = 0;
    
    i64 ans = 0;
    
    for (int i = 1; i <= n; i++) {
        while (h[s.back()] > h[i]) {
            i64 height = h[s.back()];
            i64 r = w[s.back()];
            s.pop_back();
            i64 l = w[s.back()];
            // cout << " what the hell " << l << " " << r << " : " << height << "\n";
            sum = norm(sum - C(r - l) * C(height) % P);
            sum = norm(sum + C(r - l) * C(h[i]) % P);
        }
        // cout << sum << "\n";
        ans = norm(ans + sum * (w[i] - w[i - 1]) % P);
        // cout << ans << " ";
        ans = norm(ans + C(w[i] - w[i - 1]) * C(h[i]) % P);
        // cout << ans << "\n";
        sum = norm(sum + (w[i] - w[i - 1]) * C(h[i]) % P);
        s.push_back(i);
    }
    
    cout << ans << "\n";
    
    return 0;
}

Compilation message

fancyfence.cpp: In function 'int main()':
fancyfence.cpp:22:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |     freopen("input1.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 0.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 27.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -