func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long inf = 1e15;   long long l, r;   void Input() { cin >> l >> r; }   void Solve() {     if (r <= 10) {       long long Res = 0;       for (long long a = l; a <= r; ++a) {         for (long long b = l; b <= a; ++b) Res = max(Res, a % b);       }       cout << Res;     } else {       long long m = max(r / 2 + 1, l);       cout << max(r % l, r % m);     }     cout <<   n ;   }   int main() {     if (fopen( trash.inp ,  r ))       freopen( trash.inp ,  r , stdin), freopen( trash.out ,  w , stdout);     ios::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     int Test;     cin >> Test;     while (Test--) {       Input();       Solve();     }   }   