leetcoe.557 Reverse Words in a String III

Question

Given a string, you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order.

Example 1:

Input: "Let's take LeetCode contest"Output: "s'teL ekat edoCteeL tsetnoc"

Note: In the string, each word is separated by single space and there will not be any extra space in the string.

Solution

reverse 异或交换

void reverse(int b, int e, char *s) {    while (b < e) {        s[b] = s[b] ^ s[e];        s[e] = s[b] ^ s[e];        s[b] = s[b] ^ s[e];        b++;        e--;    }}char* reverseWords(char* s) {    int i, s_len = strlen(s), index = 0;        for (i = 0; i <= s_len; i++) {        if (s[i] == ' ' || s[i] == '\0') {            reverse(index, i - 1, s);            index = i + 1;        }    }        return s;}