Submission #378384

#	Time	Username	Problem	Language	Result	Execution time	Memory
378384		astoria	Group Photo (JOI21_ho_t3)	C++14	0 / 100	1 ms	1260 KiB

Main

#include "bits/stdc++.h"
using namespace std;

const int N=505;
int n,h[N];

int mn(int i, int j){
	if(i!=-1&&j!=-1) return min(i,j);
	else return max(i,j);	
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL); cout.tie(NULL);
	cin>>n;
	for(int i=1; i<=n; i++) cin>>h[i];
	h[0]=0;
	int ord[n+5];
	for(int i=1; i<=n; i++) ord[h[i]]=i;
	
	int supp[N][N];
	memset(supp,0,sizeof(supp));
	for(int i=n-1; i>=1; i--){
		for(int j=0; j<=h[i]; j++) supp[i][j]=supp[i][j+1]+1;
		for(int j=h[i]+1; j<N; j++) supp[i][j]=supp[i][j+1];
	}

	int dp[N];
	memset(dp,-1,sizeof(dp));
	dp[0]=0;
	for(int i=1; i<=n; i++){
		int trans=0;
		for(int j=i-1; j>=0; j--){
			trans += supp[ord[j]][j];
			trans -= supp[ord[j]][i];
			trans -= supp[ord[j]][i];
			trans += N-i;
			dp[i]=mn(dp[i],dp[j]+trans);
		}
	}
	cout<<dp[n];
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 7
• Subtask 3: 0 / 32
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36