Submission #1112810

#	Time	Username	Problem	Language	Result	Execution time	Memory
1112810		julia_08	Coins (IOI17_coins)	C++17	100 / 100	11 ms	1924 KiB

coins

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

vector<int> coin_flips(vector<int> b, int c){
  vector<int> flips;

  int x = 0;

  int pos = 0;

  for(int i=0; i<b.size(); i++){
    if(b[i] == 1) x ^= pos;

    pos ++;
  }

  flips.push_back(x ^ c);

  return flips;
}

int find_coin(vector<int> b){

  int coin = 0;

  int pos = 0;

  for(int i=0; i<b.size(); i++){
    if(b[i] == 1) coin ^= pos;

    pos ++;
  }

  return coin;
}

Compilation message (stderr)

coins.cpp: In function 'std::vector<int> coin_flips(std::vector<int>, int)':
coins.cpp:12:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |   for(int i=0; i<b.size(); i++){
      |                ~^~~~~~~~~
coins.cpp: In function 'int find_coin(std::vector<int>)':
coins.cpp:29:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |   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