Submission #473681

#	Time	Username	Problem	Language	Result	Execution time	Memory
473681		ZaZo_	Genetics (BOI18_genetics)	C++14	19 / 100	2081 ms	2276 KiB

genetics

// G - Even Odd
#include <bits/stdc++.h>
#define ZAZO ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define int unsigned long long
using namespace std;
// i have maximum 65 chuncks , each chuck will have 64 bits (elements)
unsigned long long bits[4100][65];
int n , m , k ;

bool check(int x , int y)
{
  int cnt=0;
  for(int i = 0 ; i < 65 ; i++)
  cnt += __builtin_popcountll(bits[x][i]^bits[y][i]);
  if(cnt == k) return true;
  return false;
}

int32_t main() {
  ZAZO
  cin >> n >> m >> k;
  for(int i = 0 ; i < n ; i++)
  {
    for(int j = 0 ; j < m ; j ++)
    {
      char s; cin >> s;
      // get the bit you want by checking mod
      int pos = ((unsigned long long) 1<<j%64);
      // set the bit to one in the specific place in the specific chunk;
      if(s == 'C') bits[i][j/64] |= pos;
    }
  }
  map<int,int>ans;
  for(int i = 0 ; i < n ; i ++)
  {
    for(int j = i+1 ; j < n ; j ++)
    {
      bool ok = check(i , j);
      if(ok)
      {
        ans[i]++; ans[j]++;
        if(ans[i] == n-1) {
          cout<<i+1;
          return 0;
        }
        if(ans[j] == n-1){
          cout<<j+1;
          return 0;
        }
      }
    }
  }
}

• Subtask 1: 0 / 27
• Subtask 2: 19 / 19
• Subtask 3: 0 / 28
• Subtask 4: 0 / 26