Submission #387998

#	Time	Username	Problem	Language	Result	Execution time	Memory
387998		izanbf	Coins (IOI17_coins)	C++14	100 / 100	13 ms	1536 KiB

coins

#include "coins.h"

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

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

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