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Submission #628722

# Submission time Handle Problem Language Result Execution time Memory
628722 2022-08-13T15:51:55 Z Iwanttobreakfree Fancy Fence (CEOI20_fancyfence) C++17
30 / 100
 91 ms 4472 KB 
#include <iostream>
#include <vector>
#include <map>
#include <stack>
using namespace std;
const int mod=1e9+7;
#define int long long
signed main(){
    int n;
    cin>>n;
    vector<int> v(n),h(n),pre(n+1);
    map<int,int> mp;
    for(int& i:h)cin>>i;
    for(int& i:v)cin>>i;
    for(int i=0;i<n;i++)pre[i+1]=(pre[i]+v[i])%mod;
    stack<pair<int,int>> st;
    st.push({0,n});
    vector<pair<int,int>> comp(n);
    for(int i=n-1;i>=0;i--){
        while(st.top().first>=h[i])st.pop();
        int dif=pre[st.top().second]-pre[i];
        if(dif<0)dif+=mod;
        comp[i]={h[i],dif};
        st.push({h[i],i});
    }
    int ans=0;
    for(int i=0;i<n;i++){
        pair<int,int> x=comp[i];
        //cout<<(1ll*x.first*(x.first+1)/2)<<' '<<(1ll*x.second*(x.second+1)/2)<<'\n';
        ans+=(((x.first*(x.first+1)/2)%mod)*((x.second*(x.second+1)/2)%mod))%mod;
        ans%=mod;
        if(i){
            pair<int,int> y=comp[i-1];
            ans-=(((y.first*(y.first+1)/2)%mod)*((x.second*(x.second+1)/2)%mod))%mod;
            if(ans<0)ans=((ans%mod)+mod)%mod;
        }
    }
    //cout<<(((1ll*(mod-7)*(mod-6)/2)%mod)*((1ll*(mod-7)*(mod-6)/2)%mod))%mod<<' ';
    cout<<ans;
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Incorrect 1 ms 340 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 212 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 212 KB Output is correct
2 Incorrect 1 ms 340 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 340 KB Output is correct
2 Correct 9 ms 596 KB Output is correct
3 Correct 41 ms 2236 KB Output is correct
4 Correct 79 ms 4176 KB Output is correct
5 Correct 91 ms 4180 KB Output is correct
6 Correct 0 ms 212 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 8 ms 596 KB Output is correct
4 Correct 38 ms 2248 KB Output is correct
5 Correct 74 ms 4192 KB Output is correct
6 Correct 76 ms 4184 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 8 ms 856 KB Output is correct
9 Correct 40 ms 2380 KB Output is correct
10 Correct 76 ms 4428 KB Output is correct
11 Correct 77 ms 4472 KB Output is correct
12 Correct 0 ms 212 KB Output is correct

Subtask #6
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Incorrect 1 ms 212 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 212 KB Output is correct
2 Incorrect 1 ms 340 KB Output isn't correct
3 Halted 0 ms 0 KB -