Submission #821074

#	Time	Username	Problem	Language	Result	Execution time	Memory
821074		khshg	Coins (IOI17_coins)	C++14	100 / 100	9 ms	1440 KiB

coins

#include "coins.h"

std::vector<int> coin_flips(std::vector<int> b, int c) {
    std::vector<int> flips(1);
	int x = 0;
	for(int i = 0; i < 64; ++i) {
		x ^= (b[i] ? i : 0);
	}
	flips[0] = (x ^ c);
    return flips;
}

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

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