Submission #958342

#	Time	Username	Problem	Language	Result	Execution time	Memory
958342		kilkuwu	Coins (IOI17_coins)	C++17	100 / 100	8 ms	1996 KiB

coins

#include "coins.h"

std::vector<int> coin_flips(std::vector<int> b, int c) {
  int xor_sum = 0;
  int n = b.size();
  for (int i = 0; i < n; i++) {
    if (b[i]) xor_sum ^= i;
  }

  int flip = c ^ xor_sum;
  return {flip};
}

int find_coin(std::vector<int> b) {
  int xor_sum = 0;
  int n = b.size();
  for (int i = 0; i < n; i++) {
    if (b[i]) xor_sum ^= i;
  }
  return xor_sum;
}

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