Submission #1174332

#	Time	Username	Problem	Language	Result	Execution time	Memory
1174332		3lektra	Coins (IOI17_coins)	C++20	100 / 100	5 ms	584 KiB

coins

#include<bits/stdc++.h>
#include "coins.h"

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

    if(b[a])b[a] = 0;
    else b[a] = 1;

    std::vector<int> d;
    d.push_back(a);

    return d;
}

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

    return c;
}

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