oj.uz

Submission #477497

# Submission time Handle Problem Language Result Execution time Memory
477497 2021-10-02T10:06:35 Z niloyroot Fancy Fence (CEOI20_fancyfence) C++14
100 / 100
 37 ms 7876 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pl = pair<ll,ll>;
using vi = vector<ll>;
using ml = map<ll,ll>;
const ll mod=1000000007;
#define pb push_back
#define forp(i,a,b) for(ll i=a;i<=b;i++)
#define forn(i,a,b) for(ll i=a;i>=b;i--)
#define newl '\n'
#define form(m,it) for(auto it=m.begin();it!=m.end(); it++)
#define ff first
#define ss second

ll nc2(ll a){
    ll b=a+1; 
    if(a%2==0){
        a/=2;
    } else {
        b/=2;
    }
    return (a*b)%mod;
}

void solve(){
    ll n; cin>>n;
    ll h[n+1],w[n+1];
    forp(i,1,n){cin>>h[i];}
    forp(i,1,n){cin>>w[i];}
    ll dp[n+1],m[n+1],pre[n+1];
    stack<pl> st;
    st.push({0,0}); 
    dp[0]=pre[0]=h[0]=w[0]=0;
    forp(i,1,n){
        pre[i]=pre[i-1]+w[i]; pre[i]%=mod;
        while(st.top().ff>h[i]){
            st.pop();
        }
        m[i]=st.top().second;
        st.push({h[i],i});
    }
    ll ans=0,j,c,d;
    forp(i,1,n){
        j=m[i];
        dp[i]=dp[j];
        c=nc2(h[i]); c+=mod; c%=mod; c*=(pre[i]-pre[j]); c+=mod; c%=mod;
        dp[i]+=c; dp[i]+=mod; dp[i]%=mod;
        c=nc2(h[i]); c+=mod; c%=mod; c*=nc2(w[i]-1); c+=mod; c%=mod;
        d=nc2(h[i]); d+=mod; d%=mod; d*=(w[i]-1); d+=mod; d%=mod; d*=(pre[i-1]-pre[j]); d+=mod; d%=mod;
        c+=d; c+=mod; c%=mod;
        ans+=c; ans+=mod; ans%=mod;
        ans+=(dp[j]*(w[i]-1)); ans+=mod; ans%=mod;
        ans+=dp[i]; ans+=mod; ans%=mod;
    }
    cout<<(ans+mod)%mod<<newl;
}

int main() {
    ios_base::sync_with_stdio(false); 
    cin.tie(NULL); 
    solve();
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 332 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 13 ms 2564 KB Output is correct
4 Correct 29 ms 5576 KB Output is correct
5 Correct 23 ms 4816 KB Output is correct
6 Correct 21 ms 4304 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 3 ms 844 KB Output is correct
3 Correct 13 ms 3020 KB Output is correct
4 Correct 31 ms 5836 KB Output is correct
5 Correct 31 ms 5840 KB Output is correct
6 Correct 0 ms 204 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 3 ms 976 KB Output is correct
4 Correct 18 ms 4048 KB Output is correct
5 Correct 27 ms 7736 KB Output is correct
6 Correct 34 ms 7868 KB Output is correct
7 Correct 1 ms 336 KB Output is correct
8 Correct 3 ms 976 KB Output is correct
9 Correct 17 ms 4048 KB Output is correct
10 Correct 30 ms 7652 KB Output is correct
11 Correct 28 ms 7748 KB Output is correct
12 Correct 1 ms 208 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 0 ms 208 KB Output is correct
4 Correct 1 ms 316 KB Output is correct
5 Correct 1 ms 208 KB Output is correct
6 Correct 0 ms 208 KB Output is correct
7 Correct 1 ms 208 KB Output is correct
8 Correct 1 ms 328 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 0 ms 208 KB Output is correct
12 Correct 1 ms 336 KB Output is correct
13 Correct 1 ms 336 KB Output is correct
14 Correct 1 ms 336 KB Output is correct
15 Correct 2 ms 324 KB Output is correct
16 Correct 1 ms 208 KB Output is correct

Subtask #7
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 0 ms 208 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 0 ms 208 KB Output is correct
6 Correct 1 ms 320 KB Output is correct
7 Correct 0 ms 208 KB Output is correct
8 Correct 0 ms 208 KB Output is correct
9 Correct 0 ms 208 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 14 ms 3084 KB Output is correct
12 Correct 22 ms 6600 KB Output is correct
13 Correct 25 ms 5936 KB Output is correct
14 Correct 23 ms 5448 KB Output is correct
15 Correct 2 ms 336 KB Output is correct
16 Correct 4 ms 964 KB Output is correct
17 Correct 14 ms 4024 KB Output is correct
18 Correct 30 ms 7732 KB Output is correct
19 Correct 35 ms 7876 KB Output is correct
20 Correct 1 ms 336 KB Output is correct
21 Correct 3 ms 976 KB Output is correct
22 Correct 15 ms 4024 KB Output is correct
23 Correct 32 ms 7616 KB Output is correct
24 Correct 34 ms 7780 KB Output is correct
25 Correct 0 ms 208 KB Output is correct
26 Correct 1 ms 324 KB Output is correct
27 Correct 1 ms 336 KB Output is correct
28 Correct 1 ms 336 KB Output is correct
29 Correct 1 ms 336 KB Output is correct
30 Correct 3 ms 848 KB Output is correct
31 Correct 3 ms 848 KB Output is correct
32 Correct 16 ms 3128 KB Output is correct
33 Correct 16 ms 3152 KB Output is correct
34 Correct 26 ms 5960 KB Output is correct
35 Correct 35 ms 5940 KB Output is correct
36 Correct 37 ms 6084 KB Output is correct
37 Correct 30 ms 6088 KB Output is correct
38 Correct 1 ms 208 KB Output is correct
39 Correct 27 ms 6176 KB Output is correct
40 Correct 31 ms 6132 KB Output is correct
41 Correct 30 ms 6208 KB Output is correct
42 Correct 30 ms 6972 KB Output is correct