Submission #152134

#	Time	Username	Problem	Language	Result	Execution time	Memory
152134		HungAnhGoldIBO2020	Homecoming (BOI18_homecoming)	C++14	0 / 100	51 ms	23784 KiB

homecoming

#include "homecoming.h"
#include<iostream>
#include<vector>
using namespace std;
const int n=2e6+2;
const long long inf=1e18+2;
long long dp[n][2][2],sum[n];			//co chon khong , loai nao
long long solve(int N,int K,int* A,int* B){
	int i;
	for(i=0;i<N;i++){
		sum[i]=B[i];
		if(i){
			sum[i]+=sum[i-1];
		}
	}
	dp[0][0][0]=0;
	dp[0][1][1]=A[0]-sum[K-1];
//	cout<<dp[0][1][1]<<endl;
	for(i=1;i<N;i++){
		dp[i][0][0]=max(dp[i-1][0][0],dp[i-1][1][0]);
		dp[i][0][1]=max(dp[i-1][0][1],dp[i-1][1][1]);
		if(i+K-1<N){
			dp[i][1][0]=max(dp[i-1][1][0]+A[i]-B[i+K-1],dp[i-1][0][0]+A[i]-sum[i+K-1]+sum[i-1]);
			dp[i][1][1]=max(dp[i-1][1][1]+A[i]-B[i+K-1],dp[i-1][0][1]+A[i]-sum[i+K-1]+sum[i-1]);
		}
		else{
			dp[i][1][0]=max(dp[i-1][1][0]+A[i]-B[i+K-1-N],dp[i-1][0][0]+A[i]-sum[i+K-1-N]-sum[N-1]+sum[i-1]);
			dp[i][1][1]=max(dp[i-1][1][1]+A[i],dp[i-1][0][1]+A[i]-sum[N-1]+sum[i-1]);
		}
		//cout<<dp[i][1][1]<<endl;
	}
	//cout<<dp[n-1][1][1]<<endl;
	return max(max(dp[N-1][0][1],dp[N-1][1][0]),max(dp[N-1][1][1],dp[N-1][0][0]));
}
//signed main(){
//	int A[]={40},B[]={20};
//	cout<<solve(1,1,A,B);
//}

• Subtask 1: 0 / 13
• Subtask 2: 0 / 18
• Subtask 3: 0 / 31
• Subtask 4: 0 / 38