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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define gc getchar_unlocked
  4. #define fo(i,n) for(i=0;i<n;i++)
  5. #define Fo(i,k,n) for(i=k;k<n?i<n:i>n;k<n?i+=1:i-=1)
  6. #define si(x)	scanf("%d",&x)
  7. #define sl(x)	scanf("%lld",&x)
  8. #define ss(s)	scanf("%s",s)
  9. #define ll long long
  10. #define pi(x)	printf("%d\n",x)
  11. #define pl(x)	printf("%lld\n",x)
  12. #define ps(s)	printf("%s\n",s)
  13. #define pb push_back
  14. #define mp make_pair
  15. #define F first
  16. #define S second
  17. #define all(x) x.begin(), x.end()
  18. #define clr(x) memset(x, 0, sizeof(x))
  19. #define sortall(x) sort(all(x))
  20. #define tr(it, a) for(auto it = a.begin(); it != a.end(); it++)
  21. #define PI 3.1415926535897932384626
  22. typedef pair<int, int>	pii;
  23. typedef pair<ll, ll>	pll;
  24. typedef vector<int>		vi;
  25. typedef vector<ll>		vll;
  26. typedef vector<pii>		vpii;
  27. typedef vector<pll>		vpll;
  28. typedef vector<vi>		vvi;
  29. typedef vector<vll>		vvl;
  30. const ll mod = 2e18;
  31. const int N = 3e5;
  32. vi g[N];
  33. int a[N];
  34. ll mpow(ll base, ll exp);
  35. string s;
  36. vll cnt;
  37.  
  38. int dig;
  39. ll y;
  40. bool f(ll val){
  41. 	ll sum = 1;
  42. 	ll beg = val;
  43. 	int x = 1;
  44. 	while(sum<y and x<dig){
  45.         x++;
  46.         if(sum >= y) return 1;
  47.         sum += beg;
  48.         if(beg >= y/val and x<dig) return 1;
  49.         beg *= val;
  50. 	}
  51. 	return sum>=y;
  52. }
  53. bool check(ll val){
  54. 	ll sum = 1;
  55. 	ll beg = val;
  56. 	int x = 1;
  57. 	while(sum<y and x<dig){
  58.         x++;
  59.         if(sum > y) return 0;
  60.         sum += beg;
  61.         beg *= val;
  62. 	}
  63. 	return sum==y;
  64. }
  65. ll bin(ll lo, ll hi){
  66. 	if(lo==hi){
  67. 		if(f(lo))
  68. 			return lo;
  69. 		return -1;
  70. 	}
  71. 	if(lo+1==hi){
  72. 		if(f(lo))
  73. 			return lo;
  74.  
  75. 		if(f(hi))
  76. 			return hi;
  77. 		return -1;
  78. 	}
  79. 	ll mid = (lo+hi)/2;
  80. 	if(f(mid)) return bin(lo, mid);
  81. 	return bin(mid+1, hi);
  82.  
  83.  
  84. }
  85. int main()
  86. {
  87. 	ios_base::sync_with_stdio(false);
  88. 	cin.tie(NULL);
  89. 	int i,n,k,j;
  90. 	int T , t;
  91. 	//freopen("input.txt", "r", stdin);
  92. 	//freopen("output.txt", "w", stdout);
  93. 	cin>>t; T = t;
  94. 	for(int zz = 1; zz <= T; zz++){
  95. 		cout<<"Case #"<<zz<<": ";
  96. 		cin>>y;
  97. 		ll x;
  98. 		Fo(dig, 64, 1){
  99. 			//2 se y
  100. 			ll can = bin(2, y);
  101. 			if (can != -1 and check(can)){
  102. 				cout<<can<<endl;
  103. 				dig = -1;
  104. 				break;
  105. 			}
  106. 		}
  107. 	}
  108.  
  109. 	return 0;
  110. }
  111.  
  112.  
Success #stdin #stdout 0s 8156KB
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Case #1: 5
https://ideone.com/hrc5Ic
my template :)
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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