Submission #930146

#	Time	Username	Problem	Language	Result	Execution time	Memory
930146		takeonicky	Stove (JOI18_stove)	C++14	20 / 100	41 ms	80620 KiB

stove

#include<bits/stdc++.h>
using namespace std;
const int MAXN = 1e3;
const long long INF = 1e15;
int n, k;
int a[MAXN+5];
long long dp[MAXN+5][MAXN+5][5];

long long f(int idx, int cnt, int state){
	if(cnt > k) return INF;
	if(idx == n){
		if(state == 1) return 0;
		else{
			if(cnt < k) return 1;
			return INF;
		}
	}
	
	long long &ret = dp[idx][cnt][state];
	if(ret != -1) return ret;
	
	ret = INF;
	if(state){
		ret = min(ret, f(idx+1, cnt, 1) + (a[idx+1]-a[idx]));
		ret = min(ret, f(idx+1, cnt, 0) + (a[idx+1]-a[idx]));
	}
	else{
		ret = min(ret, f(idx+1, cnt+1, 1) + 1);
		ret = min(ret, f(idx+1, cnt+1, 0) + 1);
	}
	return ret;
}

int main(){
	memset(dp, -1, sizeof(dp));
	cin>>n>>k;
	for(int i=1; i<=n; i++){
		cin>>a[i];
	}
	cout<<f(0,0,0)<<endl;
	return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 0 / 30
• Subtask 3: 0 / 50