func_code_string: #include <bits/stdc++.h>   using namespace std;   long long mod_factorial[100005];   long long mod_inv_factorial[100005];   long long binpow(long long a, long long b) {     long long res = 1LL;     while (b) {       if (b & 1) {         res = (res * a);       }       a = (a * a);       b >>= 1;     }     return res;   }   long long binpowmod(long long a, long long b, long long p) {     long long res = 1LL;     while (b) {       if (b & 1) {         res = (res * 1LL * a) % 1000000007;       }       a = (a * 1LL * a) % 1000000007;       b >>= 1;     }     return res;   }   long long mod_inverse(long long a) {     return binpowmod(a, 1000000007 - 2, 1000000007);   }   void precomputefact() {     mod_factorial[0] = 1;     for (int i = 1; i <= 1e5; i++) {       mod_factorial[i] = (i * 1LL * mod_factorial[i - 1]) % 1000000007;     }     mod_inv_factorial[0] = 1;     for (int i = 1; i <= 1e5; i++) {       mod_inv_factorial[i] =           ((mod_inv_factorial[i - 1]) * 1LL * mod_inverse(i)) % 1000000007;     }   }   long long modbinomial(long long n, long long k, long long p) {     long long ans = mod_factorial[n] * mod_inv_factorial[n - k] % 1000000007 *                     mod_inv_factorial[k] % 1000000007;     return ans;   }   void solve() {     int n;     cin >> n;     vector<pair<int, int>> temp;     function<bool(pair<int, int>, pair<int, int>)> comp = [](pair<int, int> a,                                                              pair<int, int> b) {       if (a.first < b.first) {         return true;       } else if (a.first == b.first) {         if (a.second > b.second) {           return true;         }       }       return false;     };     for (int i = 0; i < n; i++) {       int l, r;       cin >> l >> r;       temp.push_back(make_pair(l, r));     }     sort(temp.begin(), temp.end(), comp);     for (int i = 0; i < temp.size(); i++) {       int f = temp[i].first;       int s = temp[i].second;       if (f == s) {         cout << f <<     << s <<     << f <<   n ;       } else {         if (f == temp[i + 1].first) {           cout << f <<     << s <<     << temp[i + 1].second + 1 <<   n ;         } else if (s == temp[i + 1].second) {           cout << f <<     << s <<     << temp[i + 1].first - 1 <<   n ;         }       }     }     cout <<   n ;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     long long testcase;     cin >> testcase;     while (testcase--) {       solve();     }     return 0;   }   