Submission #1118789

#	Time	Username	Problem	Language	Result	Execution time	Memory
1118789		Minbaev	PIN (CEOI10_pin)	C++17	5 / 100	1080 ms	85428 KiB

pin

#include <bits/stdc++.h>
 
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimize("Ofast,unroll-loops")
 
using namespace std;

 
int n,m,k,q;

void solve(){
 
	cin >> n >> k;
	vector<string>v(n);
	for(auto &to:v)cin >> to;
	
	int res = 0;
	if(n <= 2000 && false){
		for(int i = 0;i<n;i++){
			for(int j = i+1;j<n;j++){
				int cnt = 0;
				for(int l = 0;l<4;l++){
					if(v[i][l] != v[j][l])cnt += 1;
				}
				if(cnt == k)res += 1;
			}
		}
	}
	else{
		map<string,int>mp;
		for(auto to:v)mp[to] += 1;
		
		for(int i = 0;i<n;i++){
//			mp[v[i]] -= 1;
			for(int j = 0;j<4;j++){
				char ch = v[i][j];
				for(int l = 0;l<=9;l++){
					char rep = (l+'0');
					if(ch == rep)continue;
					v[i][j] = rep;
					res += mp[v[i]];
				}
				for(int l = 0;l<26;l++){
					char rep = (l+'a');
					if(ch == rep)continue;
					v[i][j] = rep;
					res += mp[v[i]];
				}
				v[i][j] = ch;
			}
			mp[v[i]] -= 1;
		}
//		res /= 2;
	}
	
	
	cout << res << "\n";
	
	
	
	
	
	
	
	
	
 	
 	
 	
 	
 	
 	
}
/*
 
*/
 signed main()
{
//	freopen("seq.in", "r", stdin);
//  freopen("seq.out", "w", stdout);
	ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL);
	int tt=1;//cin>>tt;
	while(tt--)solve();
 
}

• Subtask 1: 5 / 100