Submission #424451

#	Time	Username	Problem	Language	Result	Execution time	Memory
424451		ScarletS	Coins (IOI17_coins)	C++17	100 / 100	12 ms	1552 KiB

coins

#include <bits/stdc++.h>

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

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

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