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Determine index of one integer in another integer - online programming question

Problem Description : Determine index of one integer in another integer

i.e If input A = 23,B = 1472367 then Output : 3 . Because '23' is 3rd index in '1472367'.

Asked in Company : Futurescape Technologies Pvt Ltd  via Codility.com

Ans : 

#import <Foundation/Foundation.h>
// you can also use other imports, for example:
// #import <SomeLibrary/SomeFile.h>

// you can write to stdout for debugging purposes, e.g.
// printf("this is a debug message\n");

int solution(int A, int B) {
    // write your code in Objective-C 2.0
    NSString *strA = [NSString stringWithFormat:@"%d",A];
    NSString *strB = [NSString stringWithFormat:@"%d",B];
 
   NSRange range =   [strB rangeOfString:strA];
   if(range.location == NSNotFound)
   return -1;
   else
   return range.location;
}


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