Submission #1153133

#	Time	Username	Problem	Language	Result	Execution time	Memory
1153133		ezzzay	Group Photo (JOI21_ho_t3)	C++20	5 / 100	5093 ms	424 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ff first
#define ss second
#define pb push_back
const int N=3e5+5;
int a[N];
signed main(){
	int n;
	cin>>n;
	for(int i=0;i<n;i++){
		cin>>a[i];
	}
	vector<int>v(n);
	
	for(int i=0;i<n;i++)v[i]=i;
	int ans=n*n;
	do{
		vector<int>tmp(n);
		for(int i=0;i<n;i++){
			tmp[i]=a[v[i]];
		}
		bool u=1;
		int k=0;
		for(int i=0;i<n;i++){
			for(int j=i+1;j<n;j++){
				if(tmp[j]<tmp[i] and tmp[i]-tmp[j] >= (j-i)*2){
					u=0;
				}
				if(v[j]<v[i])k++;
			}
		}
		if(u)ans=min(ans,k);
		
	}while(next_permutation(v.begin(),v.end()));
	cout<<ans;
}

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