Submission #386926

#	Time	Username	Problem	Language	Result	Execution time	Memory
386926		BlancaHM	Coins (IOI17_coins)	C++14	100 / 100	13 ms	1840 KiB

coins

#include "coins.h"
using namespace std;

vector<int> coin_flips(vector<int> b, int c) {
    vector<int> flips;
    int val = 0;
    for (int i = 0; i < 64; i++) {
        if (b[i] == 1)
            val ^= i;
    }
    // val XOR x = c
    // val XOR val XOR x = val XOR c
    // x = val XOR c = c XOR val
    flips.push_back(val ^ c);
    return flips;
}

int find_coin(vector<int> b) {
    int val = 0;
    for (int i = 0; i < 64; i++) {
        if (b[i] == 1)
            val ^= i;
    }
    return val;
}

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