Submission #831107

#	Time	Username	Problem	Language	Result	Execution time	Memory
831107		PanosPask	Coins (IOI17_coins)	C++14	100 / 100	11 ms	1548 KiB

coins

#include "coins.h"

std::vector<int> coin_flips(std::vector<int> b, int c) {
    std::vector<int> flips(1);

    int N = 64;

    int xorsum = 0;
    for (int i = 0; i < N; i++) {
        if (b[i])
            xorsum = xorsum ^ i;
    }

    flips[0] = xorsum ^ c;

    return flips;
}

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

    return xorsum;
}

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