Problem Link : https://www.spoj.com/problems/PRIMES2/ My Tle Solution : https://pastebin.com/wXtp0wVf In this problem you have to generate primes upto 10^9 . Time limit: 2.281s
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i thought that sieve algorithm is the best algorithm to generate prime numbers and if n is 1e9 we use segmented sieve but sieve and segmented sieve have the same time complexity so i start searching for something else "thanks to you :p " i find an old post on codeforces that it may help you :D