Submission #918538

#	Time	Username	Problem	Language	Result	Execution time	Memory
918538		fuad27	Coins (IOI17_coins)	C++17	0 / 100	7 ms	1792 KiB

coins

#include "coins.h"

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

}

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

Compilation message (stderr)

coins.cpp: In function 'std::vector<int> coin_flips(std::vector<int>, int)':
coins.cpp:5:18: 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++)
      |                 ~^~~~~~~~~
coins.cpp: In function 'int find_coin(std::vector<int>)':
coins.cpp:14:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |     for(int i = 0;i<b.size();i++)
      |                   ~^~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 15
• Subtask 3: 0 / 10
• Subtask 4: 0 / 15
• Subtask 5: 0 / 50