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  1. #include <map>  
  2. #include <cmath>  
  3. #include <ctime>  
  4. #include <deque>  
  5. #include <queue>  
  6. #include <stack>  
  7. #include <cctype>  
  8. #include <cstdio>  
  9. #include <string>  
  10. #include <vector>  
  11. #include <climits>  
  12. #include <cstdlib>  
  13. #include <cstring>  
  14. #include <fstream>  
  15. #include <iomanip>  
  16. #include <numeric>  
  17. #include <sstream>  
  18. #include <utility>  
  19. #include <iostream>  
  20. #include <algorithm>  
  21.  
  22. using namespace std; 
  23.  
  24. class AliceGameEasy { 
  25. public: 
  26.    long long findMinimumValue( long long x, long long y )  
  27.    { 
  28.      	long long sum = x + y; 
  29.      	long long root = (long long) sqrt(1 + 8 * sum); 
  30.  
  31.      	if(root * root != 1 + 8 * sum) 
  32.        		return -1; 
  33.  
  34.      	long long round = (-1 + root) / 2; 
  35.      	long long sol = 0; 
  36.      	long long s = 0; 
  37.  
  38.      	if(round == 0 || x == 0) 
  39.        		return 0; 
  40.  
  41.      	for(int i=round;i>=1;i--) 
  42.      	{ 
  43.       		if(s + i >= x) 
  44.         		return sol + 1; 
  45.       	else 
  46.       	{ 
  47.         	s += i; 
  48.         	sol ++; 
  49.       	} 
  50.      }
  51.      return -1; 
  52.    } 
  53. };
  54.  
  55. int main() 
  56. {
  57. 	AliceGameEasy obj;
  58. 	cout << obj.findMinimumValue( 0, 1) << endl;
  59. 	return 0;
  60. }
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https://ideone.com/GyXaFW
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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