Submission #1086253

#	Time	Username	Problem	Language	Result	Execution time	Memory
1086253		codexistent	Coins (IOI17_coins)	C++14	100 / 100	9 ms	1828 KiB

coins

#include "coins.h"

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

    xr %= 64;
    flips[0] = xr ^ c;

    return flips;
}

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

    xr %= 64;
    return xr;
}

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