func_code_string: #include <bits/stdc++.h>   using namespace std;   int32_t main() {     long long t;     cin >> t;     while (t--) {       long long n;       cin >> n;       long long mnr = 1e9, mxl = -1e9;       for (long long i = 0; i < n; i++) {         long long l, r;         cin >> l >> r;         mnr = min(mnr, r);         mxl = max(mxl, l);       }       cout << (n == 1 ? 0 : max(mxl - mnr, 0ll)) <<   n ;     }   }   