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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) * 2;
  28.  
  29.  
  30. 	int left = mid - k;
  31. 	if(left<0){
  32. 		sum += abs(left);
  33. 		left = 0;
  34. 	}
  35.  
  36. 	int right = mid - (n-k) - 1;
  37. 	if(right<0){
  38. 		sum += abs(right);
  39. 		right = 0;
  40. 	}
  41.  
  42. 	sum -= (left*(left+1)/2 + right*(right+1)/2 + mid);
  43.  
  44. 	return sum<=m;
  45.  
  46. }
  47.  
  48. void consistency(int n, int m, int k){
  49.  
  50. 	int s = 1, e = INF;
  51.  
  52. 	while(s<e){
  53. 		int mid = s + (e-s+1)/2;
  54. 		if(isPossible(n, m, k, mid)){
  55. 			s = mid;
  56. 		}
  57. 		else e = mid-1;;
  58. 	}
  59.  
  60. 	cout << e << endl;
  61.  
  62. }
  63.  
  64. void solve() {
  65.  
  66.     int n, m, k;
  67.     cin>>n >> m >> k;
  68.  
  69.     consistency(n, m, k);
  70.  
  71.  
  72. }
  73.  
  74.  
  75.  
  76.  
  77.  
  78. int32_t main() {
  79.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  80.  
  81.     int t = 1;
  82.     cin >> t;
  83.     while (t--) {
  84.         solve();
  85.     }
  86.  
  87.     return 0;
  88. }
Success #stdin #stdout 0.01s 5280KB
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https://ideone.com/vVYlLm
language:
C++14 (gcc 8.3)
created:
13 hours ago
visibility:
public

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