Submission #859316

#	Time	Username	Problem	Language	Result	Execution time	Memory
859316		nguyentunglam	Coins (IOI17_coins)	C++17	100 / 100	7 ms	1948 KiB

coins

#include "coins.h"
#include<bits/stdc++.h>
using namespace std;

std::vector<int> coin_flips(std::vector<int> b, int c) {

   int Xor = 0;
   for(int i = 0; i < b.size(); i++) if (b[i]) Xor ^= i;

   int change = Xor ^ c;

   return {change};
}

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

Compilation message (stderr)

coins.cpp: In function 'std::vector<int> coin_flips(std::vector<int>, int)':
coins.cpp:8:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |    for(int i = 0; i < b.size(); i++) if (b[i]) Xor ^= i;
      |                   ~~^~~~~~~~~~
coins.cpp: In function 'int find_coin(std::vector<int>)':
coins.cpp:17:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |    for(int i = 0; i < b.size(); i++) if (b[i]) ret ^= i;
      |                   ~~^~~~~~~~~~

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