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Submission #930335

# Submission time Handle Problem Language Result Execution time Memory
930335 2024-02-19T11:47:18 Z vjudge1 Fancy Fence (CEOI20_fancyfence) C++17
15 / 100
 21 ms 2016 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))/2%mod) * ((nw*(nw+1))/2%mod)%mod);
          //  cout << (((now.first*(now.first+1))/2%mod) * ((nw*(nw+1))/2%mod)%mod) << 'a' << endl;
            ans %= mod;
            if(!st.empty()) {
                ans -= ((st.top().first*(st.top().first+1))/2%mod) * ((nw*(nw+1))/2%mod)%mod;
              //  cout << ((st.top().first*(st.top().first+1))/2%mod) * ((nw*(nw+1))/2%mod)  << 'b'<< endl;
                ans += mod;
                ans %= mod;
            }
            else {
                ans -= ((h[i]*(h[i]+1))/2%mod) * ((nw*(nw+1))/2%mod)%mod;
                ans += mod;
                ans %= mod;
            }
        }
        if(!st.empty()) {
            st.top().second += nw;
            st.push({h[i],w[i]});

        }
        else {
        st.push({h[i],w[i]+nw});
       // cout << h[i] << ' ' << w[i]+nw << 's' << endl;
        }
    }
    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))/2%mod) * ((nw*(nw+1))/2%mod)%mod);
          //  cout << (((now.first*(now.first+1))/2%mod) * ((nw*(nw+1))/2%mod)%mod) << 'c' << endl;
            ans %= mod;
            if(!st.empty()) {
                ans -= ((st.top().first*(st.top().first+1))/2%mod) * ((nw*(nw+1))/2%mod)%mod;
           //     cout << ((st.top().first*(st.top().first+1))/2%mod) * ((nw*(nw+1))/2%mod)%mod << 'd' << endl;
                ans += mod;
                ans %= mod;
            }
        }
    cout << ans%mod << endl;
    return 0;
}

Subtask #1
0.0 / 0.0

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

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 504 KB Output is correct
2 Correct 2 ms 604 KB Output is correct
3 Correct 10 ms 1116 KB Output is correct
4 Correct 18 ms 2016 KB Output is correct
5 Correct 21 ms 1884 KB Output is correct
6 Correct 0 ms 348 KB Output is correct

Subtask #5
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 2 ms 604 KB Output is correct
4 Correct 9 ms 1116 KB Output is correct
5 Correct 20 ms 1880 KB Output is correct
6 Correct 20 ms 1884 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 2 ms 604 KB Output is correct
9 Incorrect 11 ms 1372 KB Output isn't correct
10 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 0 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 0 ms 344 KB Output is correct
2 Incorrect 0 ms 348 KB Output isn't correct
3 Halted 0 ms 0 KB -