can u plz tell me what is the error in my code.i have already optimised my code. Link is
Prime visit (prime number between two number)
You are supposed to use the prime seive optimisation technique. Also make sure that you call the primeseive function that you will make before the test cases only to prevent TLE.
Precompute the prime numbers using sieve technique.
In the sieve technique where you create a boolean array of 1000005 size.
And start from the first prime number i.e. 2. Take its square(4) and increment it by the number you took (i.e. 4,6,8,10 and so on). Mark all these as false since they cannot be primes.
Now take the next unmarked number, 3. And mark 9,12,15 and so as false. Similarly do it for 4. 16,20,24 and so on as false.
When you finish the loop, take input of a and b and count the number of primes within the range.