Submission #917408

#	Time	Username	Problem	Language	Result	Execution time	Memory
917408		PM1	PIN (CEOI10_pin)	C++17	60 / 100	342 ms	16408 KiB

pin

#include <bits/stdc++.h>
using namespace std;
#define ll long long
const int mxn=5e4+5;
int n,d;
string s[mxn];
map<vector<char>,int>mp[(1<<4)];
ll ans[4];
int main(){
	cin>>n>>d;
	for(int i=1;i<=n;i++){
		cin>>s[i];
		for(int j=0;j<(1<<4)-1;j++){
			int cnt=0;
			vector<char>v;
			for(int k=0;k<4;k++){
				if(j&(1<<k)){
					cnt++;
					v.push_back(s[i][k]);
				}
			}
			ans[3-cnt]+=mp[j][v];
			mp[j][v]++;
			//cout<<j<<" "<<mp[j][v]<<endl;
		}//cout<<endl;
	}
	ans[1]-=(ans[0]*3);
	ans[2]-=(ans[1]*2+ans[3]*3);
	ans[3]-=ans[1]+ans[2]+ans[0];
	cout<<ans[d-1]<<'\n';
}

• Subtask 1: 60 / 100