Submission #668650

#	Time	Username	Problem	Language	Result	Execution time	Memory
668650		finn__	Coins (IOI17_coins)	C++17	100 / 100	9 ms	1396 KiB

coins

#include "coins.h"

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

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

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