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  1. #include <bits/stdc++.h>
  2. #include <iostream>
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7.  
  8.  
  9. int N;
  10. cin >> N;
  11. int A1,B1,A2,B2;
  12. cin >> A1;
  13. cin >> B1;
  14. for (int i=0;i<N-1;i++)
  15. {
  16.   cin >> A2;
  17.   cin >> B2;
  18.  
  19.   if ((A2>B1) || (B2<A1))
  20.   {
  21.       cout<<"NO\n"<<endl; exit;
  22.       return 0;
  23.   }
  24.  
  25.   A1=A2;
  26.   B1=B2;
  27. }
  28.  
  29.   cout << "YES\n" << endl;
  30.  
  31. return 0;
  32. }
  33.  
Success #stdin #stdout 0.01s 5288KB
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stdin
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5
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stdout
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YES
https://ideone.com/vpmOx7
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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