Submission #122861

#	Time	Username	Problem	Language	Result	Execution time	Memory
122861		tjd229	Coins (IOI17_coins)	C++14	100 / 100	14 ms	1580 KiB

coins

#include "coins.h"

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

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

Compilation message (stderr)

coins.cpp: In function 'std::vector<int> coin_flips(std::vector<int>, int)':
coins.cpp:4:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < b.size(); ++i) if (b[i]) c ^= i;
                  ~~^~~~~~~~~~
coins.cpp: In function 'int find_coin(std::vector<int>)':
coins.cpp:10:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < b.size(); ++i) if (b[i]) c ^= i;
                  ~~^~~~~~~~~~

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