bool ContainsDuplicates( apstring str ) { int i, j; for( i = 0; i < str.length( ); i++ ) { for( j = i + 1; j < str.length( ); j++ ) { if( str[ i ] == str[ j ] ) return true; } } return false; }2. The simplest solution is:
int CountChars( apstring source, apstring target ) { int count = 0; int t; int s; if( ContainsDuplicates( target ) ) return -1; for( t = 0; t < target.length( ); t++ ) { for( s = 0; s < source.length( ); s++ ) { if( source[ s ] == target[ t ] ) count++; } } return count; }