Submission #824146

#	Time	Username	Problem	Language	Result	Execution time	Memory
824146		abczz	Coins (IOI17_coins)	C++14	100 / 100	8 ms	1552 KiB

coins

#include "coins.h"
#include <iostream>
#include <vector>
#define ll long long

using namespace std;

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

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

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