Submission #334443

#	Time	Username	Problem	Language	Result	Execution time	Memory
334443		nikatamliani	Coins (IOI17_coins)	C++14	100 / 100	12 ms	2096 KiB

coins

#include "coins.h"
#include <bits/stdc++.h>
using namespace std;
vector<int> coin_flips(std::vector<int> b, int c) {
    int x = 0;
    for(int i = 0; i < b.size(); ++i) {
    	x ^= b[i] * i;
	}
	x ^= c;
	return vector<int>{x};
}

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

Compilation message (stderr)

coins.cpp: In function 'std::vector<int> coin_flips(std::vector<int>, int)':
coins.cpp:6:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    6 |     for(int i = 0; i < b.size(); ++i) {
      |                    ~~^~~~~~~~~~
coins.cpp: In function 'int find_coin(std::vector<int>)':
coins.cpp:15:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |  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