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void Reverse(char s[])
{
    for(int i = 0, j = strlen(s) - 1; i < j; ++i, --j) {
        char c = s[i];
        s[i] = s[j];
        s[j] = c;
    }
}
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    a ^= b;
    b ^= a;
    a ^= b;
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char* strrev1(const char* str)
{
       int len = strlen(str);
       char* tmp = new char[len + 1];
        strcpy(tmp,str);
       for (int i = 0; i < len/2; ++i)
       {
          char c = tmp[i];
           tmp[i] = tmp[len – i - 1];
           tmp[len – i - 1] = c;
        }
       return tmp;
}
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char* strrev2(const char* str)
{
       char* tmp = new char[strlen(str) + 1];
        strcpy(tmp,str);
       char* ret = tmp;
       char* p =


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[root@localhost test]# hexdump -s 0 -n 52 -C helloworld
00000000  7f 45 4c 46 01 01 01 00  00 00 00 00 00 00 00 00  |.ELF............|
00000010  02 00 03 00 01 00 00 00  10 83 04 08 34 00 00 00  |............4...|
00000020  30 08 00 00 00 00 00 00  34 00 20 ......

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/* bitscount.c£ºÎ»¼ÆÊý */
/* ¼ÆËãxÖÐ1λµÄÊýÄ¿£º·½°¸1£¬²ÉÓ÷ÖÖβßÂÔ */
inline int pop(unsigned x){
/* ¶Ôÿ¸ö2λ×ֶΣ¬ÏÈÎö³öÆäÓҶ˵Ä1룬ÔÙÎö³öÆä×ó¶ËµÄ1λ£¬È»ºóÈÃÕâÁ½¸öλÏà¼Ó */
x=(x & 0x55555555)+((x>>1) & 0x555555 ......
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