Title: 剑指 Offer 第2题：替换空格 Date: 2019-10-17 14:11:43 Modified: 2019-10-17 14:11:43 Category: Interview Tags: Data Structure, Algorithm Slug: ci-02-replace-space
题目描述
请实现一个函数，将一个字符串中的每个空格替换成“%20”。例如，当字符串为We Are Happy.则经过替换之后的字符串为We%20Are%20Happy。
代码
class Solution {
public:
void replaceSpace(char *str,int length) {
if (str == NULL) return;
if (length <= 0) return;
int spaceCount = 0;
int i = 0;
while(str[i] != '\0'){
if (str[i] == ' ') spaceCount++;
i++;
}
if (spaceCount == 0) return;
int originLength = i;
int newLength = i + spaceCount * 2;
i = originLength - 1;
int j = newLength - 1;
str[j+1] = '\0';
while(i >= 0){
if (str[i] == ' '){
str[j] = '0';
str[j-1] = '2';
str[j-2] = '%';
j -= 3;
i--;
}else{
str[j] = str[i];
i--;
j--;
}
}
}
};