Codeforces 484(#276 Div 1) A Bits 乱搞

 1 // Author: darkdream
 2 // Created Time: 2014年11月06日 星期四 00时24分10秒
 3 
 4 #include<vector>
 5 #include<list>
 6 #include<map>
 7 #include<set>
 8 #include<deque>
 9 #include<stack>
10 #include<bitset>
11 #include<algorithm>
12 #include<functional>
13 #include<numeric>
14 #include<utility>
15 #include<sstream>
16 #include<iostream>
17 #include<iomanip>
18 #include<cstdio>
19 #include<cmath>
20 #include<cstdlib>
21 #include<cstring>
22 #include<ctime>
23 #define LL long long
24 
25 using namespace std;
26 int main(){
27     int n ;
28     LL l , r;
29     scanf("%d",&n);
30     for(int i = 1;i <= n;i ++)
31     {
32         LL ans = 0 ; 
33         scanf("%I64d %I64d",&l,&r);
34         for(int i = 62 ;i >= 0 ;i --)
35         {
36             if((r&(1ll << i)) != 0 )
37             {
38                 if((l & (1ll << i)) != 0 )
39                 {
40                     ans += (1ll << i);
41                     r &=  (~(1ll << i));
42                     l &=  (~(1ll << i));
43                 }else{
44                     if((1ll << (i+1))-1 <= r)
45                     {
46                         ans +=  (1ll << (i+1)) -1;
47                     }
48                     else ans += (1ll << i ) - 1; 
49                     break;
50                 }
51             }
52 
53         }
54         printf("%I64d\n",ans);
55     }
56     return 0;
57 }