- Added C++ solution by Ulrich Rieke.

1 files changed, 80 insertions, 0 deletions

diff --git a/challenge-067/ulrich-rieke/cpp/ch-2.cpp b/challenge-067/ulrich-rieke/cpp/ch-2.cpp
new file mode 100644
index 0000000000..d31d4e8c33
--- /dev/null
+++ b/challenge-067/ulrich-rieke/cpp/ch-2.cpp
@@ -0,0 +1,80 @@
+#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 ;
+}