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  1. ///ELECTION POSTERS
  2.  
  3. #include <bits/stdc++.h>
  4. #define pb push_back
  5. #define mp make_pair
  6. #define f first
  7. #define s second
  8. using namespace std;
  9.  
  10. vector <pair<int,int> > segment;
  11. vector <int> aux;
  12. set <int> s;
  13. int len,len2,w[80002],acum[300];
  14.  
  15.  
  16. void paint(int l,int r,int color){
  17. 	int in=l/len2,fin=r/len2;
  18. 	if(r-l+1<=len2){
  19. 		for(int i=l;i<=r;i++) w[i]=color;
  20. 		return;
  21. 	}
  22. 	if(in*len2<l) in++;
  23. 	for(int i=l; i<in*len2; i++) w[i]=color;
  24. 	for(in; in<fin;in++) acum[in]=color;
  25. 	for(int i=fin*len2; i<=r; i++) w[i]=color;
  26. 	return;
  27. }
  28.  
  29. int main() {
  30. 	int t;
  31. 	cin>>t;
  32. 	while(t--){
  33. 		int n,x,y;
  34. 		scanf("%d",&n);
  35. 		for(int i=0; i<n; i++){
  36. 			scanf("%d%d",&x,&y);
  37. 			segment.pb(mp(x,y));
  38. 			s.insert(x);
  39. 			s.insert(y);
  40. 		} 
  41. 		for(auto i:s) aux.pb(i);
  42. 		for(int i=0; i<n; i++){
  43. 			int s1=segment[i].f,s2=segment[i].s;
  44. 			segment[i].f=lower_bound(aux.begin(), aux.end(),s1)-aux.begin();
  45. 			segment[i].s=lower_bound(aux.begin(), aux.end(),s2)-aux.begin();
  46.  
  47. 		}
  48. 		len=s.size(),len2=sqrt(len);
  49. 		for(int i=0;i<n;i++){
  50. 			paint(segment[i].f,segment[i].s,i+1);
  51. 		}
  52. 		set <int> res;
  53. 		for(int i=0;i<len;i++){
  54. 			if(w[i]==0 and acum[i/len2]==0) continue;
  55. 			res.insert(max(w[i],acum[i/len2]));
  56. 			w[i]=0;
  57. 		} 
  58. 		for(int i=0;i<(len+len2-1)/len2;i++) acum[i]=0;
  59. 		printf("%d\n",res.size());
  60. 		aux.clear();
  61. 		segment.clear();
  62. 		s.clear();
  63. 	}
  64. 	return 0;
  65. }
Time limit exceeded #stdin #stdout 5s 4364KB
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https://ideone.com/k3glHi
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
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