Submission #154354

#	Time	Username	Problem	Language	Result	Execution time	Memory
154354		dolphingarlic	Coins (IOI17_coins)	C++14	100 / 100	12 ms	1800 KiB

coins

#include "coins.h"

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

int find_coin(std::vector<int> b) {
    int xr = 0;
    for (int i = 0; i < b.size(); i++) {
        xr ^= b[i] * i;
    }
    return xr;
}

Compilation message (stderr)

coins.cpp: In function 'std::vector<int> coin_flips(std::vector<int>, int)':
coins.cpp:6:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < b.size(); i++) {
                     ~~^~~~~~~~~~
coins.cpp: In function 'int find_coin(std::vector<int>)':
coins.cpp:15:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < b.size(); i++) {
                     ~~^~~~~~~~~~

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