Submission #864230

#	Time	Username	Problem	Language	Result	Execution time	Memory
864230		abcvuitunggio	Coins (IOI17_coins)	C++17	100 / 100	7 ms	1624 KiB

coins

#include "coins.h"
#include <vector>
#define V std::vector <int>
V coin_flips(V b, int c) {
    for (int i=0;i<64;i++)
        c^=b[i]*i;
    return {c};
}
int find_coin(V b) {
    return coin_flips(b,0)[0];
}

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