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  1. #include <iostream>
  2. #include<bits/stdc++.h>
  3. using namespace std;
  4. typedef long long int ll;
  5.  
  6. const int MAX = 1000000;
  7.  
  8. int main() {
  9. 	vector<ll>p_i(MAX+1);
  10.  
  11.     for(ll i = 2; i<=MAX;i++) p_i[i]=i;
  12.     for(ll i = 2 ; i<=MAX ;i++){
  13.     	if(p_i[i]==i){
  14.     		for(ll j = i ; j<=MAX; j+=i) {
  15.     			if(p_i[j]==j) p_i[j]=i;
  16.     		}
  17.     	}
  18.     }
  19.     for(ll i = 1 ; i<=100;i++) cout<<p_i[i]<<" ";
  20.     return 0;
  21. }
Success #stdin #stdout 0.03s 11172KB
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stdin
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Standard input is empty
stdout
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0 2 3 2 5 2 7 2 3 2 11 2 13 2 3 2 17 2 19 2 3 2 23 2 5 2 3 2 29 2 31 2 3 2 5 2 37 2 3 2 41 2 43 2 3 2 47 2 7 2 3 2 53 2 5 2 3 2 59 2 61 2 3 2 5 2 67 2 3 2 71 2 73 2 3 2 7 2 79 2 3 2 83 2 5 2 3 2 89 2 7 2 3 2 5 2 97 2 3 2
https://ideone.com/UXT51y
language:
C++ (gcc 8.3)
created:
17 days ago
visibility:
public

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