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  1. /*
  2. 	This script/program belongs to alphaguy4[Github]
  3. */
  4. #include <iostream>
  5. #include <iterator>
  6. #include <utility>
  7. #include <memory.h>
  8. #include <queue>
  9. #include <stack>
  10. #include <stdio.h>
  11. #include <math.h>
  12. #include <stdlib.h>
  13. #include <string.h>
  14. #include <algorithm>
  15. #include <set>
  16. #include <map>
  17. #include <vector>
  18. #include <ctype.h>
  19.  
  20. #define si(i) scanf("%d",&i)
  21. #define sll(i) scanf("%lld",&i)
  22. #define ss scanf("\n%s",i)
  23. #define ll long long
  24. #define pb push_back
  25. #define mp make_pair
  26. #define fs first
  27. #define sc second
  28. #define pii pair<int,int>
  29. #define pll pair<ll,ll>
  30. #define REP(i,n) for(int i=0;i<n;i++)
  31. #define FOR(i,j,n) for(int i=j;i<n;i++)
  32. #define FORR(i,j,n) for(int i=n-1;i>-1;i--)
  33. #define test(t) int t;si(t);while(t--)
  34. #define M 1000000007
  35. #define PI 3.141592653589793
  36. #define sort(a) sort(a.begin(),a.end())
  37. #define rev(a) reverse(a.begin(),a.end())
  38. using namespace std;
  39.  
  40. typedef vector<int> vi;
  41. typedef vector<pair<int,int> > vii;
  42. typedef vector<pair<int,pair<int,int> > > viii;
  43. typedef vector<pair<string,int> > vsi;
  44. typedef set<int> si;
  45. typedef map<int,int> mii;
  46. typedef map<string,int> msi;
  47. si s,s1;
  48. mii m;
  49. set<int> :: iterator it,jt;
  50. void compress_and_insert(int n){
  51. 	int c=1;
  52. 	for(it = s1.begin();it != s1.end();it++){
  53. 		s.insert(c);
  54. 		m[*it] = c++;
  55. 	}
  56.  
  57. }
  58. int main(){
  59. 	int n;
  60. 	test(t){
  61. 		si(n);
  62. 		vii v,c;
  63. 		v.clear();
  64. 		m.clear();
  65. 		s1.clear();
  66. 		int a,b;
  67. 		REP(i,n){
  68. 			si(a);
  69. 			si(b);
  70. 			v.pb(mp(a,b));
  71. 			s1.insert(a);
  72. 			s1.insert(b);
  73. 		}
  74. 		rev(v);
  75. 		compress_and_insert(n);
  76. 		int ans=0;
  77. 		s.insert(M);
  78. 		REP(i,n){
  79. 			int a = m[v[i].fs];
  80. 			int b = m[v[i].sc];
  81. 			//cout << a << " " << b << endl;
  82. 			it = s.lower_bound(a);
  83. 			jt = s.upper_bound(b);
  84. 			//cout << a << " " << *it << endl;
  85. 			//cout << b << " " << *jt << endl;
  86. 			if(it != jt){
  87. 				s.erase(it,jt);
  88. 				ans++;
  89. 			}
  90. 			//for(it = s.begin();it!=s.end();it++)
  91. 			//	cout << *it << " ";
  92. 			//cout << endl;
  93. 		}
  94. 		cout << ans << endl;
  95. 	}
  96. 	return 0;
  97. }
Runtime error #stdin #stdout 0.12s 3468KB
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https://ideone.com/AibFQ7
language:
C++14 (clang 8.0)
created:
7 years ago
visibility:
secret

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