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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.  
  6.   int n; cin >> n;
  7.   vector<int> a(n), b(n);
  8.   for (int i = 0; i < n; ++i) {
  9.     cin >> a[i] >> b[i];
  10.     if (i &&  max(a[i], a[i-1]) > min(b[i], b[i-1])) {
  11.         cout << "NO\n"; 
  12.       return 0;
  13.     }
  14.   }
  15.   cout << "YES\n";
  16. }
  17.  
Success #stdin #stdout 0.01s 5280KB
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stdin
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3
3 6
2 4
2 6
stdout
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YES
https://ideone.com/XuTPCW
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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