Answers for "sieve of eresthossis cp c++"

C++

0

sieve of eresthossis cp c++

int n;
vector<char> is_prime(n+1, true);
is_prime[0] = is_prime[1] = false;
for (int i = 2; i <= n; i++) {
    if (is_prime[i] && (long long)i * i <= n) {
        for (int j = i * i; j <= n; j += i)
            is_prime[j] = false;
    }
}

Posted by: Guest on November-09-2020

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