Submission #1282889

#	Time	Username	Problem	Language	Result	Execution time	Memory
1282889		red_souls	Fancy Fence (CEOI20_fancyfence)	C++20	0 / 100	3 ms	576 KiB

fancyfence

#include <bits/stdc++.h>
#define ll long long
#define task "Histogram"
using namespace std;

const int N = 1e5 + 16;
const ll INF = 1e18, mod = 1e9 + 7;
int n;
ll w[N], h[N];

namespace sub6 {

    ll result;

    void solve() {
        for (int i = 1; i <= n; i++) {
            ll minH = h[i], sumW = w[i];
            ll cntW = w[i] * (w[i] + 1) >> 1;
            ll cntH = h[i] * (h[i] + 1) >> 1;
            result = (result + cntW * cntH % mod) % mod;

            for (int j = i - 1; j >= 1; j--) {
                minH = min(minH, h[j]);
                result = (result + sumW * minH % mod) % mod;
                sumW += w[j];
            }
        }
        cout << result;
    }
}

int main() {
    ios_base :: sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }

    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> h[i];
    }
    for (int i = 1; i <= n; i++) {
        cin >> w[i];
    }
    sub6 :: solve();

    return 0;
}

Compilation message (stderr)

fancyfence.cpp: In function 'int main()':
fancyfence.cpp:38:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
fancyfence.cpp:39:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• 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