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#include <stdio.h>
#define bits(p, d) { \
int _tmp=p->d, _bits=0; \
for (p->d=1; p->d; p->d<<=1) \
_bits++; \
p->d=_tmp; \
printf("%s->%s has %d bits", #p, #d, _bits); \
}
typedef struct _s{
int a:4;
} S;
int main()
{
S tmp, *s = &tmp;
bits(s,a);
}
/* Êä³ö£º s->a has 4 bits */


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int find(int *ID, int N)
{
int candidate;
int nTimes, i;
for (i = nTimes = 0; i < N; i++)
{
if (nTimes == 0)
{
candidate = ID[i];
nTimes = 1;
}
else if (candidate == ID[i])
{
nTimes++;
}
else
{
nTimes--;
......

C³ÌÐò£ºÊä³ö1,2,3,..,nµÄËùÓÐ×éºÏÊý

/*
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ÔòÏÔÈ»¼ÓÉÏ£¬now..n£¬¶¼ÊÇеÄ×éºÏÊý£¬¶ÔÓÚÿһ¸ö£¬{ Êä³öÖ®£¬È»ºóµÝ¹é£¬´¦Àí _c(n, cur+1, a, i+1) }
*/
/* Êä³ö1,2,3,..,nµÄ×éºÏÊý */
#include <stdio.h>
#include <assert.h>
#include <malloc.h>
void ......
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