Submission #87719

#	Time	Username	Problem	Language	Result	Execution time	Memory
87719		ioane	Building Bridges (CEOI17_building)	C++14	30 / 100	3067 ms	2036 KiB

building

//https://www.spoj.com/problems/EC_P/
//https://www.spoj.com/problems/tag/scc
#include <bits/stdc++.h>
#define F first
#define S second
#define I insert
#define LL long long
#define PB push_back
#define MP make_pair
const LL N=100005, mod=998244353;
using namespace std;
LL n, m, i, j, k, l, r, t, h[N], a[N], dp[N], sum, ans;
void dpn2(){
    for(i=1;i<n;i++){
        sum=0;dp[i]=mod;
        for(j=i-1;j>=0;j--){
            dp[i]=min(dp[i],dp[j]+sum+(h[i]-h[j])*(h[i]-h[j]));
            sum+=a[j];
        }
    }
    cout<<dp[n-1]<<endl;
    exit(0);
}
int main(){
    ios::sync_with_stdio(false);
    cin>>n;
    for(i=0;i<n;i++)cin>>h[i];
    for(i=0;i<n;i++){cin>>a[i];sum+=a[i];}
    if(n<=1000)dpn2();
    ans=sum+(h[0]-h[n-1])*(h[0]-h[n-1]);
    for(i=1;i<n-1;i++){
        ans=min(ans,sum-a[i]+(h[0]-h[i])*(h[0]-h[i])+(h[n-1]-h[i])*(h[n-1]-h[i]));
    }
    for(i=1;i<n-1;i++){
        for(j=i+1;j<n-1;j++){
            ans=min(ans,sum-a[i]-a[j]+(h[0]-h[i])*(h[0]-h[i])+(h[j]-h[i])*(h[j]-h[i])+(h[j]-h[n-1])*(h[j]-h[n-1]));
        }
    }
    cout<<ans<<endl;
    return 0;
}
//      IIIIIIIII      OOOOO             A          NN        N    EEEEEEEEEE
//          I         O     O           A A         N N       N    E
//          I        O       O         A   A        N  N      N    E
//          I        O       O        A     A       N   N     N    E
//          I        O       O       AAAAAAAAA      N    N    N    EEEEEEEE
//          I        O       O      A         A     N     N   N    E
//          I        O       O     A           A    N      N  N    E
//          I         O     O     A             A   N       N N    E
//      IIIIIIIII      OOOOO     A               A  N        NN    EEEEEEEEEE ___ KAPANADZE

• Subtask 1: 30 / 30
• Subtask 2: 0 / 30
• Subtask 3: 0 / 40