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#include <string>
#include <iostream>
#include <map>
#include <vector>
std::vector<std::string> combineStrings( const std::string & worda ,
const std::string & wordb) {
std::vector<std::string> combis ;
int lena = worda.size( ) ;
int lenb = wordb.size( ) ;
if ( lena > 0 && lenb == 0 ) {
for ( int i = 0 ; i < lena ; i++ ) {
combis.push_back( worda.substr( i , 1 ) ) ;
}
}
if ( lena == 0 && lenb > 0 ) {
for ( int i = 0 ; i < lenb ; i++ ) {
combis.push_back( wordb.substr( i , 1 ) ) ;
}
}
if ( lena > 0 && lenb > 0 ) {
for ( int i = 0 ; i < lena ; i++ ) {
for ( int j = 0 ; j < lenb ; j++ ) {
combis.push_back( worda.substr( i , 1 ) + wordb.substr( j , 1 ) ) ;
}
}
}
return combis ;
}
std::vector<std::string> combineStringsWithString( std::vector<std::string>
& words, std::string & expression ) {
std::vector<std::string> newWords ;
if ( ! expression.empty( ) ) {
int len = expression.size( ) ;
for ( auto word : words ) {
for ( int i = 0 ; i < len ; i++ ) {
word.append( expression.substr( i , 1 )) ;
newWords.push_back( word ) ;
}
}
}
else
newWords = words ;
return newWords ;
}
int main( int argc, char * argv[] ) {
std::map<std::string, std::string> phone { {"1" , "_,@"} , {"2", "ABC" },
{"3" , "DEF"} , {"4" , "GHI"} , {"5" , "JKL"} , {"6" , "MNO"} ,
{"7" , "PQRS"} , {"8", "TUV"} , {"9", "WXYZ"} , {"0" , ""}} ;
std::string input( argv[1] ) ;
std::vector<std::string> combis ;
int len = input.size( ) ;
if ( len == 1 ) {
std::string word ( phone[ input ] ) ;
if ( !word.empty( ) ) {
for ( int i = 0 ; i < word.length( ) ; i++ ) {
combis.push_back( word.substr( i , 1 ) ) ;
}
}
}
if ( len == 2 ) {
combis = combineStrings( phone[ input.substr( 0 , 1 )] ,
phone[ input.substr( 1 , 1 )] ) ;
}
if ( len > 2 ) {
combis = combineStrings( phone[ input.substr( 0 , 1 )] ,
phone[ input.substr( 1 , 1 )] ) ;
for ( int i = 2 ; i < len ; i++ ) {
combis = combineStringsWithString( combis,
phone[ input.substr( i , 1 )] ) ;
}
}
for ( auto & str : combis ) {
std::cout << str << " " ;
}
std::cout << std::endl ;
return 0 ;
}
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