제출 #1125771

#제출 시각아이디문제언어결과실행 시간메모리
1125771EfeBabagilFancy Fence (CEOI20_fancyfence)C++20
0 / 100
1095 ms2120 KiB
#include <bits/stdc++.h> #include <stdio.h> using namespace std; #define int long long int mod=1e9+7; int l=20; int32_t main() { int n; cin>>n; vector<int> h(n),w(n); for(int i=0;i<n;i++) cin>>h[i]; for(int i=0;i<n;i++) cin>>w[i]; int ans=0; for(int i=0;i<n;i++) { int row,col; row=(((h[i]+1)*h[i])/2)%mod; col=(((w[i]+1)*w[i])/2)%mod; ans=(ans+row*col)%mod; } vector<array<int,20>> sparce(n); for(int i=0;i<n;i++) { sparce[i][0]=h[i]; } for(int b=1;b<20;b++) { for(int i=0;i<n;i++) { if(i+(1<<(b-1))<n) sparce[i][b]=min(sparce[i][b-1],sparce[i+(1<<(b-1))][b-1]); } } for(int i=0;i<n;i++) { for(int j=i+1;j<n;j++) { int d=j-i; int k=__lg(d); int mn=min(sparce[i][k],sparce[j-(1<<k)][k]); ans=(ans+((w[i]*w[j])%mod)*(((mn*(mn+1))/2)%mod))%mod; } } cout<<ans<<endl; return 0; }
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