func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long n;     cin >> n;     vector<int> prime(n + 2, 1);     prime[0] = 0;     prime[1] = 0;     long long ans = 1;     for (long long i = 2; i <= n + 1; i++) {       if (prime[i] == 1 && i * i <= n + 1) {         for (long long j = i * i; j <= n + 1; j += i) {           prime[j] = 2;         }         ans = 2;       }     }     cout << ans << endl;     for (long long i = 2; i <= n + 1; i++) cout << prime[i] <<    ;     cout << endl;   }   