func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 200010;   int main() {     int t;     cin >> t;     while (t--) {       int a, b;       cin >> a >> b;       int s = abs(a - b);       int ans = s / 5;       s %= 5;       if (s > 2)         ans += 2;       else if (s != 0)         ans++;       cout << ans << endl;     }     return 0;   }   