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  1. #include <iostream>
  2. #include <bits/stdc++.h>
  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)
  20.   {
  21.       cout<<"NO\n"<<endl;
  22.       B1= min(B1,B2);
  23.       A1 = max(A2,A1);
  24.       return 0;
  25.   }
  26.   else if (B2<A1)
  27.   {
  28.       cout<<"NO\n"<<endl;
  29.       B1= min(B1,B2);
  30.       A1 = max(A2,A1);
  31.       return 0;
  32.   }
  33.  
  34.   else if (A2>B2)
  35.   {
  36.       cout<<"NO\n"<<endl;
  37.       B1= min(B1,B2);
  38.       A1 = max(A2,A1);
  39.       return 0;
  40.   }
  41.   A1=A2;
  42.   B1=B2;
  43. }
  44.  
  45.   cout << "YES\n" << endl;
  46.  
  47. return 0;
  48. }
Success #stdin #stdout 0s 5320KB
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stdin
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stdout
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https://ideone.com/dvyaqX
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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