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  1.  
  2. #include<bits/stdc++.h>
  3. using namespace std;
  4.  
  5. const long long MaxN = 1e5 + 5;
  6.  
  7. long long n;
  8. pair<long long,long long> a[MaxN];
  9.  
  10. int main()
  11. {
  12.     if(fopen("stline.inp","r"))
  13.     {
  14.         freopen("stline.inp","r",stdin);
  15.         freopen("stline.out","w",stdout);
  16.     }
  17.  
  18.     ios_base::sync_with_stdio(0);
  19.     cin.tie(0);
  20.  
  21.     cin >> n;
  22.  
  23.     for(long long i=1; i<=n; i++)
  24.     {
  25.         cin >> a[i].first >> a[i].second;
  26.     }
  27.  
  28.     sort(a+1,a+n+1);
  29.  
  30.     long long ans=0;
  31.     long long x=a[1].second;
  32.  
  33.     for(long long i=2; i<=n; i++)
  34.     {
  35.         if(a[i].first<x)
  36.         {
  37.             ans++;
  38.             x=min(x,a[i].second);
  39.         }
  40.         else
  41.         {
  42.             x=a[i].second;
  43.         }
  44.     }
  45.  
  46.     cout << ans;
  47.  
  48.     return 0;
  49. }
  50.  
Success #stdin #stdout 0s 5320KB
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https://ideone.com/GYExaG
language:
C++14 (gcc 8.3)
created:
4 hours ago
visibility:
public

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