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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7.     int n;
  8.     cin>>n;
  9.     int pos[n],val[n];
  10.     for(int i=0; i<n; i++)
  11.         cin>>pos[i]>>val[i];
  12.  
  13.     int freq[200001]= {};
  14.  
  15.     for(int i=0; i<n; i++)
  16.     {
  17.         if(freq[val[i]]==0)freq[val[i]]=pos[i];
  18.         else if(freq[val[i]]>pos[i])
  19.         {
  20.             cout<<"NO";
  21.             return 0;
  22.         }
  23.         else freq[val[i]]=pos[i];
  24.     }
  25.     cout<<"YES";
  26.     return 0;
  27. }
  28.  
Success #stdin #stdout 0s 4500KB
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stdin
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stdout
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YES
https://ideone.com/qIzC4q
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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