Primevisits (geting all the worng ans)

#1

do tell me what is wrong in it. https://ide.codingblocks.com/s/122365

#2

hi @vikashkmr519 ,
Here in the loop with index j you have done jj<=b whereas it should be jj<=i as we want to check all the j for a particular index i … Like in the case where i=5 you are going to check all the index till b . And then j=5 is valid because (5*5=25) which is less than b(100) .

#3

this code in the ide is showing timelimit exceed for the 3 test case, please check it sir

#4

That is because the algorithm you have used checks for each value in between a and b.There is a method to find primes and then store it in a boolean array. Method is known as Sieve of Eratosthenes.This method will reduce time taken .In the method make a boolean array of b+1 size and make all the fields as true and then run from 2 till sqrt(n) and if value at index i is true then do all the further multiple of i as false. Now use a second loop from a to search number of true in the array . This will give you your count in less time.

#5

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