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#include <iostream>
#include <string>
#include <vector>
#include <sstream>
#include <algorithm>
std::vector<std::string> split( const std::string & text , char delimiter ) {
std::vector<std::string> tokens ;
std::istringstream istr { text } ;
std::string word ;
while ( std::getline( istr , word , delimiter ) ) {
tokens.push_back( word ) ;
}
return tokens ;
}
int main( ) {
std::cout << "Enter some integers separated by whitespace!\n" ;
std::string line ;
std::getline( std::cin , line ) ;
auto tokens { split( line , ' ' ) } ;
std::vector<int> numbers ;
for ( auto s : tokens )
numbers.push_back( std::stoi( s ) ) ;
while ( numbers.size( ) > 1 ) {
std::sort( numbers.begin( ) , numbers.end( ) ) ;
int len = numbers.size( ) ;
if ( numbers[len - 2] == numbers[len - 1] ) {
numbers.pop_back( ) ;
numbers.pop_back( ) ;
}
else {
numbers[ len - 1 ] = numbers[ len - 1 ] - numbers[ len - 2 ] ;
numbers.erase( numbers.begin( ) + len - 2 ) ;
}
}
if ( numbers.size( ) == 1 ) {
std::cout << *numbers.begin( ) ;
}
else {
std::cout << 0 ;
}
std::cout << '\n' ;
return 0 ;
}
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