Submission #829585

#	Time	Username	Problem	Language	Result	Execution time	Memory
829585		Rifal	Coins (IOI17_coins)	C++14	100 / 100	8 ms	1556 KiB

coins

#include <bits/stdc++.h>
#include "coins.h"

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

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

Compilation message (stderr)

coins.cpp: In function 'std::vector<int> coin_flips(std::vector<int>, int)':
coins.cpp:7:22: 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++) {
      |                    ~~^~~~~~~~~~
coins.cpp: In function 'int find_coin(std::vector<int>)':
coins.cpp:16:22: 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