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Sieve linear

Outstanding Ox answered on May 23, 2021 Popularity 8/10 Helpfulness 6/10

answer Sieve linear

Sieve linear

Comment

const int N = 10000000;
int lp[N+1];
vector<int> pr;

for (int i=2; i<=N; ++i) {
    if (lp[i] == 0) {
        lp[i] = i;
        pr.push_back (i);
    }
    for (int j=0; j<(int)pr.size() && pr[j]<=lp[i] && i*pr[j]<=N; ++j)
        lp[i * pr[j]] = pr[j];
}

Popularity 8/10 Helpfulness 6/10 Language whatever

Source: cp-algorithms.com

Tags: sieve whatever

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