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#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
std::vector<std::string> split( const std::string & startline ,
const std::string & sep ) {
std::vector<std::string> separated ;
std::string::size_type start { 0 } ;
std::string::size_type pos ;
do {
pos = startline.find_first_of( sep , start ) ;
separated.push_back( startline.substr(start , pos - start )) ;
start = pos + 1 ;
} while ( pos != std::string::npos ) ;
return separated ;
}
int main( ) {
std::cout << "Enter some integers, separated by blanks!\n" ;
std::string numberline ;
std::getline( std::cin , numberline ) ;
std::vector<std::string> innumbers { split( numberline , " " ) } ;
std::vector<int> numbers ;
for ( auto w : innumbers )
numbers.push_back( std::stoi( w ) ) ;
std::cout << "Enter a start number!\n" ;
int start ;
std::cin >> start ;
while ( std::find( numbers.begin( ) , numbers.end( ) , start ) !=
numbers.end( ) )
start *= 2 ;
std::cout << start << '\n' ;
return 0 ;
}
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