Finding highest and lowest array count in multiple arrays

Question

I have 10 NSMutableArrays and I need to compare them by its count and select the name of the array which has the lowest count - [array count]. What would be the best and fastest method to do so?

I tried to add the names of all arrays into another array, loop through with 'for' method, but it doesn't work as NSUInteger conflicts with ID

There must be simpler method, I am sure of it. I just can't find the right reference on google...

Can you please point me the right direction?

Many thanks a.

Please find the answer here. stackoverflow.com/questions/5838480/… — Rajesh Maurya
– Rajesh Maurya, Commented Apr 2, 2016 at 7:38

JAY RAPARKA · Accepted Answer · 2015-09-15 11:43:44Z

0

first of all create array of counts of all the arrays.

than apply quicksort algorithm

here is c program of algorithm c program of quicksort

you just have to pass the newly created array in first parameter, second parameter is 0(zero) and third paramter is newly created array count - 1 in quickshort method.

get the sorted array than get first index is lowest count and last index is the highest count get index and find which array has highest and lowest count.

if you don't want to create array of count than you can directly create array of arrays but it occupies the memory so best way is to create array of count.

answered Sep 15, 2015 at 11:43

JAY RAPARKA

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Alessign · Accepted Answer · 2015-09-15 17:08:42Z

0

I found solution. Two actually. After getting all counts from all 10 arrays into new array "integers", finding smallest and highest value is easy with:

NSNumber *max=[integers valueForKeyPath:@"@max.self"];
NSNumber *min=[integers valueForKeyPath:@"@min.self"];

NSLog(@"max: %@ min: %@", max, min);

// get indexOfObject value
int indexOfMin = (int)[integers indexOfObject:min];
NSLog(@"Index: %i", indexOfMin);

Second method is:

float xmax = -MAXFLOAT;
float xmin = MAXFLOAT;
for (NSNumber *num in integers) {
    float x = [num floatValue];
    if (x < xmin) xmin = x;
    if (x > xmax) xmax = x;

    NSLog(@"integer: %f",x );
}

Thank you for pointing me the right direction!

answered Sep 15, 2015 at 17:08

Alessign

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