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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. using LL = long long;
  4.  
  5. int main() {
  6.  
  7.   int n; cin >> n;
  8.   vector<int> a(n), b(n);
  9.   for (int i = 0; i < n; ++i) {
  10.     cin >> a[i] >> b[i];
  11.     if ( max(a[i], a[i-1]) > min(b[i], b[i-1])) {
  12.       cout << "NO\n";
  13.       return 0;
  14.     }
  15.   }
  16.   cout << "YES\n";
  17. }
  18.  
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin
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5
3 6
4 7
2 4
4 5
1 5
stdout
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NO
https://ideone.com/nU0X4p
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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