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Submission #930324

# Submission time Handle Problem Language Result Execution time Memory
930324 2024-02-19T11:07:24 Z vjudge1 Fancy Fence (CEOI20_fancyfence) C++17
0 / 100
 1 ms 500 KB 
#include <bits/stdc++.h>
#include <fstream>
#define endl '\n'
#define mod 1000000007
#define INF 1000000000
#define INF2 2000000000000000000
//#define ll long long
///#define cin fin
///#define cout fout
using namespace std;
double const EPS = 1e-14;
///ofstream fout("herding.out");
///ifstream fin("herding.in");

int main()
{
    ios_base::sync_with_stdio(0);cout.tie(0);cin.tie(0);
    int n; cin >> n; long long h[n], w[n];
    for(int i = 0; i < n; i++) cin >> h[i];
    for(int i = 0; i < n; i++) cin >> w[i];
    stack<pair<long long, long long>> st;
    long long ans = 0, nw = 0;
    for(int i = 0; i < n; i++) {
         nw = 0;
        while(!st.empty() && st.top().first > h[i]) {
            pair<long long, long long> now = st.top();
            nw += now.second;
            nw %= mod;
            st.pop();
            ans += (((now.first*(now.first+1)%mod)/2) * ((nw*(nw+1)%mod)/2)%mod);
            ans %= mod;
            if(!st.empty()) {
                ans -= ((st.top().first*(st.top().first+1))%mod/2) * ((nw*(nw+1)%mod)/2)%mod;
                ans += mod;
                ans %= mod;
            }
        }
        st.push({h[i],w[i]+nw});
    }
    nw = 0;
        while(!st.empty()) {
            pair<long long, long long> now = st.top();
            nw += now.second;
            nw %= mod;
            st.pop();
            ans += (((now.first*(now.first+1)%mod)/2) * ((nw*(nw+1)%mod)/2)%mod);
            ans %= mod;
            if(!st.empty()) {
                ans -= ((st.top().first*(st.top().first+1))%mod/2) * ((nw*(nw+1)%mod)/2)%mod;
                ans += mod;
                ans %= mod;
            }
        }
    cout << ans%mod << endl;
    return 0;
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 500 KB Output is correct
2 Incorrect 0 ms 348 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 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 Correct 0 ms 344 KB Output is correct
2 Incorrect 1 ms 348 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
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 #5
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Incorrect 0 ms 472 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Incorrect 1 ms 348 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 500 KB Output is correct
2 Incorrect 0 ms 348 KB Output isn't correct
3 Halted 0 ms 0 KB -