Submission #531388

#	Time	Username	Problem	Language	Result	Execution time	Memory
531388		cadmiumsky	Coins (IOI17_coins)	C++14	100 / 100	13 ms	1532 KiB

coins

#include "coins.h"

std::vector<int> coin_flips(std::vector<int> b, int c) {
    std::vector<int> flips(1);
    int x = c;
    int y = 0;
    for(auto v : b)
      x ^= (y++) * v;
    flips[0] = x;
    return flips;
}

int find_coin(std::vector<int> b) {
  int x = 0, y = 0;
  for(auto v : b)
    x ^= v * (y++);
  return x;
}

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