Submission #658513

#	Time	Username	Problem	Language	Result	Execution time	Memory
658513		MON	Coins (IOI17_coins)	C++14	100 / 100	11 ms	1568 KiB

coins

#include "coins.h"

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

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

Compilation message (stderr)

coins.cpp: In function 'std::vector<int> coin_flips(std::vector<int>, int)':
coins.cpp:6:20: 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:15:20: 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