Submission #480233

#	Time	Username	Problem	Language	Result	Execution time	Memory
480233		mohamedsobhi777	PIN (CEOI10_pin)	C++14	70 / 100	219 ms	17928 KiB

pin

#include <bits/stdc++.h>

using namespace std;

const int N = 2e5 + 7;
int n, d; 
long long ans ; 
string st[N] ; 
map<long long,long long> atm[17] ; 

int main()
{
       ios_base::sync_with_stdio(0);
       cin.tie(0);
#ifndef ONLINE_JUDGE
#endif
       cin >> n >> d ; 
       d = 4 - d; 
       for(int i = 0 ;i < n; ++ i){
              cin >> st[i] ; 
       }
       vector<int> masks ; 
       for(int i = 0;i < 16 ;++ i){
              masks.push_back(i) ; 
       }
       sort(masks.begin(), masks.end(), [&](int x, int y){
              return __builtin_popcount(x) > __builtin_popcount(y) ; 
       }) ; 
       for(int i = 0 ;i < n; ++ i ){
              long long ret = 0 ; 
              vector<long long> dp(18, 0) ; 
              for(auto u : masks){
                     int hsh = 0 ; 
                     for(int k = 0 ; k < 4 ; ++ k){
                            if(u&(1<<k)){
                                   hsh = hsh * 150 + st[i][k] ; 
                            }
                     }
                     dp[u] += atm[u][hsh]++ ; 
                     for(int sub = u ; sub ; sub = (sub - 1) & u){
                            if(u != sub)
                                   dp[sub] -= dp[u] ; 
                     }
              }
              for(auto u : masks){
                     if(__builtin_popcount(u) == d){
                            ret += dp[u] ; 
                     }
              }

              ans += ret ; 
       }
       cout << ans ; 
       return 0;
}

• Subtask 1: 70 / 100