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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. const int maxn = 1e6 + 42;
  6.  
  7. void solve() {
  8. 	int N;
  9. 	cin >> N;
  10. 	int l, r;
  11. 	map<int, int> open, close;
  12. 	set<int> ends;
  13. 	int L = 1, R = 1e9;
  14. 	for(int i = 0; i < N; i++) {
  15. 		cin >> l >> r;
  16. 		ends.insert(l);
  17. 		ends.insert(r);
  18. 		L = max(L, l);
  19. 		R = min(R, r);
  20. 		open[l]++;
  21. 		close[r]++;
  22. 	}
  23. 	int ans = N;
  24. 	int balance = 0;
  25. 	for(auto it = begin(ends); it != prev(end(ends)); ++it) {
  26. 		balance += open[*it] - close[*it];
  27. 		if(*it >= R && L >= *next(it)) {
  28. 			ans = min(ans, balance);
  29. 		}
  30. 	}
  31. 	cout << (ans == N ? -1 : ans) << "\n";
  32. }
  33.  
  34. signed main() {
  35. 	//freopen("input.txt", "r", stdin);
  36. 	int t;
  37. 	cin >> t;
  38. 	while(t--) {
  39. 		solve();
  40. 	}
  41. }
  42.  
Runtime error #stdin #stdout 0s 4284KB
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/8PEBzV
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
secret

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