Submission #444010

#	Time	Username	Problem	Language	Result	Execution time	Memory
444010		JovanB	Coins (IOI17_coins)	C++17	100 / 100	12 ms	1532 KiB

coins

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

using namespace std;

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

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

Compilation message (stderr)

coins.cpp: In function 'std::vector<int> coin_flips(std::vector<int>, int)':
coins.cpp:9:19: 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++) x ^= b[i]*i;
      |                  ~^~~~~~~~~
coins.cpp: In function 'int find_coin(std::vector<int>)':
coins.cpp:16:19: 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++) x ^= b[i]*i;
      |                  ~^~~~~~~~~

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