Submission #290660

#	Time	Username	Problem	Language	Result	Execution time	Memory
290660		tinjyu	Coins (IOI17_coins)	C++14	100 / 100	12 ms	2028 KiB

coins

#include "coins.h"

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

int find_coin(std::vector<int> b) {
    long long int x=0;
    for(int i=0;i<b.size();i++)
    {
    	if(b[i]==1)x^=i;
	}
    return x;
}

Compilation message (stderr)

coins.cpp: In function 'std::vector<int> coin_flips(std::vector<int>, int)':
coins.cpp:6:18: 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:16:18: 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++)
      |                 ~^~~~~~~~~

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