2013成都网络赛 J A Bit Fun(水题)

A Bit Fun

Time Limit: 5000/2500 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 1148    Accepted Submission(s): 644

Problem Description
There are n numbers in a array, as a0, a1 ... , an-1, and another number m. We define a function f(i, j) = ai|ai+1|ai+2| ... | aj . Where "|" is the bit-OR operation. (i <= j)
The problem is really simple: please count the number of different pairs of (i, j) where f(i, j) < m.
 
Input
The first line has a number T (T <= 50) , indicating the number of test cases.
For each test case, first line contains two numbers n and m.(1 <= n <= 100000, 1 <= m <= 230) Then n numbers come in the second line which is the array a, where 1 <= ai <= 230.
 
Output
For every case, you should output "Case #t: " at first, without quotes. The t is the case number starting from 1.
Then follows the answer.
 
Sample Input
2
3 6
1 3 5
2 4
5 4
 
Sample Output
Case #1: 4
Case #2: 0
 
Source


关键是理解位或运算
#include<stdio.h>
int a[];
int main()
{
int t,cou=,n,m,i,j,b;
scanf("%d",&t);
while(cou<=t)
{
int ans=;
scanf("%d%d",&n,&m);
for(i=;i<n;i++)
scanf("%d",&a[i]);
for(i=;i<n;i++)
{
b=;
for(j=i;j<n;j++)
{
b|=a[j];
if(b>=m)
break;
ans++;
}
}
printf("Case #%d: %d\n",cou,ans);
cou++;
}
return ;
}
 
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