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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define int long long
  4. #define fi first
  5. #define se second
  6. #define siz(x) (int)(x.size())
  7. #define all(x) x.begin(), x.end()
  8. #define debug_arr(x,len) for(int _=1; _<=len; _++) cout<<x[_]<<" "; cout<<'\n';
  9. #define debug(x) cout<<'\n'<<#x<<": "<<x<<'\n';
  10. const int maxN = 1e5+5;
  11.  
  12. int n, m, p, a[maxN], b[maxN];
  13.  
  14. void solve()
  15. {
  16.  
  17. }
  18.  
  19. int32_t main()
  20. {
  21. 	freopen("CHECKIN.INP", "r", stdin);
  22. 	freopen("CHECKIN.OUT", "w", stdout);
  23. 	ios_base::sync_with_stdio(0); cin.tie(0);
  24. 	cin>>n>>m>>p;
  25. 	for(int i=1; i<=n; i+=1) cin>>a[i]>>b[i];
  26. 	if(p == 0)
  27. 	{
  28. 		int res = 1e18;
  29. 		for(int i=1; i<=n; i+=1)
  30. 		{
  31. 			res = min(res, b[i]);
  32. 		}
  33. 		cout<<res<<'\n';
  34. 		return 0;
  35. 	}
  36. 	int l = 0, r = 1e18, ans = 0;
  37. 	while(r - l >= 0)
  38. 	{
  39. 		int mid = (l+r)>>1;
  40. 		vector<int>v;
  41. 		for(int i=1; i<=n; i+=1)
  42. 		{
  43. 			if(a[i] == 0)
  44. 			{
  45. 				v.push_back(1e9);
  46. 				continue;
  47. 			}
  48. 			int xet = (mid - b[i]) / a[i];
  49. 			if(xet < 0) continue;
  50. 			else v.push_back(xet);
  51. 		}
  52. 		sort(all(v), greater<int>());
  53. 		int tmp = 0, ok = 0;
  54. 		for(int i=0; i<min(siz(v), m); i+=1) tmp += v[i];
  55. 		if(tmp >= p) ok = 1;
  56. 		if(siz(v) == 0) ok = 0;
  57. 		if(ok) r = mid-1, ans = mid;
  58. 		else l = mid+1;	
  59. 	}
  60. 	cout<<ans<<'\n';
  61. }
Success #stdin #stdout 0s 5300KB
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stdout 
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https://ideone.com/CZiSMl
language:
C++14 (gcc 8.3)
created:
18 hours ago
visibility:
public

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