Submission #1186649

#	Time	Username	Problem	Language	Result	Execution time	Memory
1186649		Hydrolyzed	Coins (IOI17_coins)	C++20	0 / 100	5 ms	584 KiB

coins

#include "coins.h"
#include <vector>

std::vector<int> coin_flips(std::vector<int> b, int c) {
  int sum_xor = 0;
  for(int i=0; i<64; ++i) {
    if(b[i] == 0) {
      continue;
    }
    sum_xor ^= i;
  }
  int flipping_pos = sum_xor ^ c;
  b[flipping_pos] ^= 1;
  return b;
}

int find_coin(std::vector<int> b) {
  int sum_xor = 0;
  for(int i=0; i<64; ++i) {
    if(b[i] == 0) {
      continue;
    }
    sum_xor ^= i;
  }
  return sum_xor;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 15
• Subtask 3: 0 / 10
• Subtask 4: 0 / 15
• Subtask 5: 0 / 50