Submission #524031

#	Time	Username	Problem	Language	Result	Execution time	Memory
524031		Deepesson	Coins (IOI17_coins)	C++17	100 / 100	9 ms	1532 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);
    long long xoro=0;
    for(int i=0;i!=b.size();++i)if(b[i])xoro^=(i);
    long long quer = c^xoro;
    flips[0]=quer;
    return flips;
}

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

Compilation message (stderr)

coins.cpp: In function 'std::vector<int> coin_flips(std::vector<int>, int)':
coins.cpp:7:18: 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)if(b[i])xoro^=(i);
      |                 ~^~~~~~~~~~
coins.cpp: In function 'int find_coin(std::vector<int>)':
coins.cpp:15:18: 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)if(b[i])ans^=i;
      |                 ~^~~~~~~~~~

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