Jewels And Stones

JewelsAndStones.m

- (NSInteger) jewelCountFromStone : (NSString*) stone : (NSString*) jewel
{
    NSInteger count = 0;
    NSMutableDictionary *hashmap = [[NSMutableDictionary alloc]initWithCapacity:jewel.length];
    for ( NSInteger i = 0; i< jewel.length; i++)
    {
        [hashmap setValue:[NSNumber numberWithInteger:1] forKey: [jewel substringWithRange:NSMakeRange(i,1)]];
    }
    for ( NSInteger i = 0 ; i <stone.length ; i++)
    {
        if ([hashmap valueForKey:[stone substringWithRange:(NSMakeRange (i,1))]])
        {
            count ++;
        }
    }
    return count;
}