Submission #779680

#	Time	Username	Problem	Language	Result	Execution time	Memory
779680		kirakaminski968	Coins (IOI17_coins)	C++17	100 / 100	6 ms	1572 KiB

coins

#include "coins.h"
#include <bits/stdc++.h>
using namespace std; 
vector<int> coin_flips(vector<int> b, int c) {
	std::vector<int> flips(1);
	int res = c; 
	for(int i = 0;i<b.size();++i) res ^= b[i]*i; 
	flips[0] = res; 
	return flips;
}

int find_coin(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:7:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 |  for(int i = 0;i<b.size();++i) res ^= b[i]*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) ans ^= b[i]*i;
      |                   ~^~~~~~~~~

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