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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define int              long long int
  4. #define double           long double
  5. #define print(a)         for(auto x : a) cout << x << " "; cout << endl
  6. inline int power(int a, int b) {
  7.     int x = 1;
  8.     while (b) {
  9.         if (b & 1) x *= a;
  10.         a *= a;
  11.         b >>= 1;
  12.     }
  13.     return x;
  14. }
  15.  
  16.  
  17. const int M = 1000000007;
  18. const int N = 3e5+9;
  19. const int INF = 2e9+1;
  20. const int LINF = 2000000000000000001;
  21.  
  22. //_ ***************************** START Below *******************************
  23.  
  24.  
  25. bool isPossible(int n, int m, int k, int mid){
  26.  
  27. 	int sum = mid*(mid+1)/2;
  28.  
  29. 	int left = mid - k;
  30. 	if(left<0) left = 0;
  31.  
  32. 	int right = mid - (n-k) - 1;
  33. 	if(right<0) right = 0;
  34.  
  35. 	int jobs = sum - left*(left+1)/2 + sum - right*(right+1)/2 - mid;
  36.  
  37. 	return jobs<=m;
  38.  
  39. }
  40.  
  41. void consistency(int n, int m, int k){
  42.  
  43. 	int s = n/m, e = INF;
  44.  
  45. 	while(s<e){
  46. 		int mid = s + (e-s+1)/2;
  47. 		if(isPossible(n, m, k, mid)){
  48. 			s = mid;
  49. 		}
  50. 		else e = mid-1;;
  51. 	}
  52.  
  53. 	cout << e << endl;
  54.  
  55. }
  56.  
  57. void solve() {
  58.  
  59.     int n, m, k;
  60.     cin>>n >> m >> k;
  61.  
  62.     consistency(n, m, k);
  63.  
  64.  
  65. }
  66.  
  67.  
  68.  
  69.  
  70.  
  71. int32_t main() {
  72.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  73.  
  74.     int t = 1;
  75.     cin >> t;
  76.     while (t--) {
  77.         solve();
  78.     }
  79.  
  80.     return 0;
  81. }
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/xikzVV
language:
C++14 (gcc 8.3)
created:
14 hours ago
visibility:
public

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