func_code_string: #include <bits/stdc++.h>   using namespace std;   pair<int, int> a[1010];   int main() {     int n;     scanf( %d , &n);     for (int i = 0; i < n; ++i) {       scanf( %d%d , &a[i].second, &a[i].first);       if (a[i].first < a[i].second) swap(a[i].first, a[i].second);     }     sort(a, a + n);     vector<int> ans;     int last = INT_MIN;     for (int i = 0; i < n; ++i)       if (a[i].second > last) {         ans.push_back(a[i].first);         last = a[i].first;       }     printf( %d n , (int)ans.size());     for (int c : ans) printf( %d  , c);     printf(  n );   }   