Submission #1006131

#	Time	Username	Problem	Language	Result	Execution time	Memory
1006131		AliMark71	Coins (IOI17_coins)	C++17	100 / 100	7 ms	1532 KiB

coins

#include "coins.h"

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

int find_coin(std::vector<int> b) {
    int xorSum = 0;
    for (int i = 0; i < b.size(); i++) if (b[i] == 1) xorSum ^= i;
    return xorSum;
}

Compilation message (stderr)

coins.cpp: In function 'std::vector<int> coin_flips(std::vector<int>, int)':
coins.cpp:5:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    5 |     for (int i = 0; i < b.size(); i++) if (b[i] == 1) xorSum ^= i;
      |                     ~~^~~~~~~~~~
coins.cpp: In function 'int find_coin(std::vector<int>)':
coins.cpp:13:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |     for (int i = 0; i < b.size(); i++) if (b[i] == 1) xorSum ^= i;
      |                     ~~^~~~~~~~~~

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