Submission #829801

#	Time	Username	Problem	Language	Result	Execution time	Memory
829801		Blagoj	Coins (IOI17_coins)	C++17	100 / 100	9 ms	1608 KiB

coins

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

using namespace std;

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

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

Compilation message (stderr)

coins.cpp: In function 'std::vector<int> coin_flips(std::vector<int>, int)':
coins.cpp:9:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |     for (int i = 0; i < b.size(); i++) Xor ^= i * b[i];
      |                     ~~^~~~~~~~~~
coins.cpp: In function 'int find_coin(std::vector<int>)':
coins.cpp:16:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |     for (int i = 0; i < b.size(); i++) Xor ^= i * b[i];
      |                     ~~^~~~~~~~~~

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