func_code_string: #include <bits/stdc++.h>   using namespace std;   bool p[5000020];   int prime[5000020];   void criba() {     p[0] = false;     p[1] = false;     for (int i = 2; i <= 5000000; i++) p[i] = true;     for (int i = 2; i <= 5000000; i++) {       if (p[i]) {         prime[i] = 1;         for (int h = 2; i * h <= 5000000; h++) {           p[i * h] = false;           if (h >= i and h % i == 0) {             int cnt = 0, x = i * h;             while (x % i == 0) {               cnt++;               x = x / i;             }             prime[i * h] += cnt;           } else             prime[i * h]++;         }       }     }     int sum = 0;     for (int i = 1; i <= 5000000; i++) prime[i] += prime[i - 1];   }   int main() {     int tc, a, b;     cin >> tc;     memset(prime, 0, sizeof(prime));     criba();     while (tc--) {       scanf( %d%d , &a, &b);       printf( %d n , prime[a] - prime[b]);     }     return 0;   }   