fork download
copy 
  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. 	int sum = mid*(mid+1)/2;
  27. 	int x = mid-k;
  28. 	int y = mid - (n-k+1);
  29.  
  30. 	int left = 0;
  31. 	if(x>=0){
  32. 		left = sum - (x*(x+1))/2;
  33. 	}
  34. 	else left = sum + abs(x);
  35.  
  36. 	int right = 0;
  37. 	if(y>=0){
  38. 		right = sum - (y*(y+1))/2;
  39. 	}
  40. 	else right = sum + abs(y);
  41.  
  42.  
  43. 	int total = left + right - mid;
  44.  
  45. 	return total <= m;
  46. }
  47.  
  48. void consistency(int n, int m, int k){
  49.  
  50. 	int s = 0, e = n-1;
  51. 	while(s<e){
  52. 		int mid = s + (e-s+1)/2;
  53. 		if(isPossible(n, m, k, mid)){
  54. 			s = mid;
  55. 		}
  56. 		else e = mid-1;
  57. 	}
  58.  
  59. 	cout << e << endl;
  60.  
  61. }
  62.  
  63. void solve() {
  64.  
  65.     int n, m, k;
  66.     cin>>n >> m >> k;
  67.  
  68.     consistency(n, m, k);
  69.  
  70.  
  71. }
  72.  
  73.  
  74.  
  75.  
  76.  
  77. int32_t main() {
  78.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  79.  
  80.     int t = 1;
  81.     cin >> t;
  82.     while (t--) {
  83.         solve();
  84.     }
  85.  
  86.     return 0;
  87. }
Success #stdin #stdout 0s 5316KB
comments (?)
stdin
copy 
1
5 11 3
stdout
copy 
3
https://ideone.com/pjI2KM
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!