oj.uz

Submission #703390

# Submission time Handle Problem Language Result Execution time Memory
703390 2023-02-27T08:28:50 Z Darren0724 Fancy Fence (CEOI20_fancyfence) C++17
0 / 100
 1 ms 344 KB 
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define pii pair<int,int>
#define all(x) x.begin(),x.end()
const int mod=1e9+7;
int cal(int left,int right,int up,int down){
    int width=right-left+1;
    width%=mod;
    int ans=width*(width-1)/2;
    ans%=mod;
    int tmp=up*(up+1)-down*(down+1);
    tmp/=2;
    //cout<<left<<' '<<right<<' '<<up<<' '<<down<<' '<<ans*tmp<<endl;
    return ans*tmp%mod;
}
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n;cin>>n;
    vector<int> a(n+1),b(n+1);
    for(int i=1;i<=n;i++){
        cin>>a[i];
    }
    for(int i=1;i<=n;i++){
        cin>>b[i];
        b[i]+=b[i-1];
    }
    int ans=0;
    vector<int> v;
    v.push_back(0);
    for(int i=1;i<=n;i++){
        while(a[i]<a[v.back()]){
            //cout<<"OK"<<endl;
            ans+=cal(b[v.back()-1],b[i-1],a[v.back()],a[i]);
            ans%=mod;
            v.pop_back();
        }
        if(a[i]>a[v.back()]){
            v.push_back(i);
        }
    }
    while(v.size()>1){
        int tmp=v.back();
        v.pop_back();
        ans+=cal(b[tmp-1],b[n],a[tmp],a[v.back()]);
        ans%=mod;
    }
    cout<<ans<<endl;

    return 0;
}

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 344 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 1 ms 212 KB Output is correct
2 Incorrect 1 ms 212 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 212 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 212 KB Output is correct
2 Incorrect 1 ms 340 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 212 KB Output is correct
2 Incorrect 1 ms 332 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 344 KB Output isn't correct
3 Halted 0 ms 0 KB -