Submission #1030029

#	Time	Username	Problem	Language	Result	Execution time	Memory
1030029		coolboy19521	Coins (IOI17_coins)	C++17	100 / 100	9 ms	1708 KiB

coins

#include "coins.h"

using namespace std;

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

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

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