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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. typedef pair<int,int> ii;
  5. typedef vector<ii> vii;
  6. typedef vector<int>  vi;
  7. typedef long double ld;
  8. typedef long long ll;
  9. const char *fi ="";
  10. const char *fo ="";
  11. const int  MAXN = 10000;
  12. const ld EPS = 1e-9;
  13. fstream f;
  14.  
  15.  
  16. struct point{
  17.  
  18.     int a,b,c;
  19.  
  20. };
  21.  
  22. bool compare (point x,point y){
  23.     if (x.c<y.c) return true;
  24. }
  25.  
  26. int main()
  27. {
  28. 	//freopen("t.txt","r",stdin);
  29.     int t;
  30.     int n;
  31.     while (1){
  32.         cin>>n;
  33.         if (n==0) break;
  34.         point p[n+1];
  35.  
  36.         for (int i=1;i<=n;i++) {
  37.             cin>>p[i].a>>p[i].b;
  38.             if (p[i].a<=p[i].b) swap(p[i].a,p[i].b);
  39.             p[i].c=p[i].a*p[i].b;
  40.  
  41.         }
  42.  
  43.         sort (p+1,p+n+1,compare);
  44.         int l[n+1],MAX=0;
  45.  
  46.         for (int i=1;i<=n;i++ ){
  47.             l[i]=1;
  48.             for (int j=1;j<i;j++){
  49.  
  50.                 if (p[j].a<=p[i].a && p[j].b<=p[i].b){
  51.                     l[i]=max (l[i],l[j]+1);
  52.                     if (l[i]>MAX){
  53.                         MAX=l[i];
  54.                     }
  55.                 }
  56.  
  57.             }
  58.  
  59.         }
  60.         cout<<MAX<<endl;
  61.  
  62.  
  63.     }
  64.     cout<<"*";
  65.     return 0;
  66. 	//cout << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n";//cout << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n";
  67. }
  68.  
Time limit exceeded #stdin #stdout 5s 8388607KB
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https://ideone.com/W9UHgh
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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