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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 ll long long
  7. #define si(x)	scanf("%d",&x)
  8. #define sl(x)	scanf("%lld",&x)
  9. #define ss(s)	scanf("%s",s)
  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>	pl;
  24. typedef vector<int>		vi;
  25. typedef vector<ll>		vl;
  26. typedef vector<pii>		vpii;
  27. typedef vector<pl>		vpl;
  28. typedef vector<vi>		vvi;
  29. typedef vector<vl>		vvl;
  30. int mpow(int base, int exp); 
  31. void ipgraph(int m);
  32. void dfs(int u, int par);
  33. const int mod = 1000000007;
  34. const int N = 3e5, M = N;
  35. //=======================
  36.  
  37. vi g[N];
  38. int a[N];
  39. void fac(ll no, vi &a){
  40. 	a.clear();
  41. 	while(no){
  42. 		a.pb(no%2);
  43. 		no /= 2;
  44. 	}
  45. 	while(a.size() < 60) a.pb(0);
  46. }
  47. int main()
  48. {
  49. 	ios_base::sync_with_stdio(false);
  50. 	cin.tie(NULL);
  51. 	int i,n,j;
  52. 	ll A, B;
  53. 	cin >> A >> B;
  54. 	if(A == B){
  55. 		cout << 1 << endl;
  56. 		return 0;
  57. 	}
  58. 	int r = -1, k = -1, cur = -1;
  59. 	vi L, R;
  60. 	fac(A, L);
  61. 	fac(B, R);
  62. 	int p = 59;
  63. 	while(p>=0 and L[p] == R[p]){
  64. 		if(L[p]) L[p] = R[p] = 0, A -= 1LL<<p, B -= 1LL<<p;
  65. 		p--;
  66. 	}
  67. 	fo(i, 60){
  68. 		if(L[i] != R[i]) r = i;
  69. 		if(R[i]) k = cur, cur = i;
  70. 	}
  71. 	ll T = 1LL<<r;
  72. 	//[A, T-1]
  73. 	ll ans = (T-1) - A + 1;
  74.  
  75. 	//[T, T+2^(k+1)-1]
  76. 	ans += 1LL<<(k+1);
  77. 	//[T+A, 2T-1]
  78. 	ans += 2*T-1 - (T+A) + 1;
  79. 	//If overlap
  80. 	ll x = (1LL<<(k+1)) - 1;
  81. 	if(A <=  x)
  82. 		ans -= x-A+1;
  83. 	cout << ans << endl;
  84.  
  85. 	return 0;
  86. } 
  87.  
  88.  
Success #stdin #stdout 0s 23432KB
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https://ideone.com/OMCaTU
my template :)
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
secret

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