Write a function to find elements that repeat a given N times in a given L list.

Question

Digwey@gmail.com · Accepted Answer

NSArray *mylist = @[@"Mohamed",@"Ali",@"Mohsen",@"Mohamed",@"Ali",@"Mohamed"];
    
    NSCountedSet *countedSet = [[NSCountedSet alloc] initWithArray:mylist];
    
    for(NSNumber * item in countedSet)
        NSLog(@"%@ %u", item, [countedSet countForObject:item]);

NSCountedSet. · Answer

- (id)returnElementWhichRepeat:(int)N intheList:(NSArray *)L{
    NSCountedSet *countedSet = [[NSCountedSet alloc]initWithArray:L];
    NSMutableArray *mArr = [[NSMutableArray alloc]initWithCapacity:L.count];
    for (id value in countedSet) {
        if (N == [countedSet countForObject:value]) {
            [mArr addObject:value];
        }
    }
    if ([mArr count]>0) {
        return mArr;
    }
    return nil;
}

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