Submission #114554

#	Time	Username	Problem	Language	Result	Execution time	Memory
114554		SpeedOfMagic	Coins (IOI17_coins)	C++17	100 / 100	13 ms	1676 KiB

coins

#include "coins.h"

std::vector<int> coin_flips(std::vector<int> b, int c) {
    int x = 0;
    for (int i = 0; i < 64; i++)
      x ^= b[i] * i;
    return {x^c};
}

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

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