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【剑指offer】04替换空格,C++实现 - 爱码网
Posted on
2018-03-03 11:08 wanglei5205 阅读(
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0.前言
# 替换空格为字符串部分的题目,剑指offer中字符串系列的文章地址,剑指offer全系列文章地址
1.题目
# 请实现一个函数,将一个字符串中的空格替换成“%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。
2.思路
# 从头到尾遍历字符串做替换,时间复杂度为O(n2),效率低
# 从尾到头遍历字符串做替换,时间复杂度为O(n),效率高
3.举例(从尾到头遍历字符串)
# 边界检查,判断字符数组是否为空
# 遍历字符串,统计空格总数count_space,统计替换前字符个数count_old,统计替换后字符个数count_new,其中count_new = count_old + 2*count_space
# 边界检查,判断字符数组是否越界
# 替换空格,用指针P1指向原始字符串的末尾,指针P2指向替换后字符串的末尾。向前移动指针P1,如果P1指向的元素不是空格,则将P1指向的元素复制给P2指向的位置;如果P1指向的元素是空格,则P2依次向前移动并插入%20。当P1==P2时,结束替换。

4.code
# C++字符数组存储字符串,字符数组中编译器自动添加字符串的结束标识’\0’,字符串结束标识在字符数组中占一个位置,注意字符数组的越界问题。
1 class Solution {
2 public:
3 // 指向字符数组的字符指针str,字符数组长度length
4 void replaceSpace(char *str,int length) {
5
6 // 边界检查1:判断字符数组是否为空
7 if(str=NULL)
8 return ;
9 // 遍历字符串,统计空格个数、替换前字符个数、替换后字符个数
10 int CountOfBlanks=0; // 空格个数
11 int Originallength=0;// 替换前字符个数
12 int len=0; // 替换后字符个数
13
14 for(int i=0;str[i]!='\0';++i)
15 {
16 Originallength++;
17 if(str[i]==' ')
18 ++CountOfBlanks;
19 }
20
21 len =Originallength+2*CountOfBlanks;
22
23 // 边界检查2:判断字符数组是否越界
24 if(len+1>length)
25 return ;
26
27 // 替换空格
28 char*pStr1=str+Originallength;// 字符指针指向原始字符串的末尾
29 char*pStr2=str+len; // 字符指针指向替换后字符串的末尾
30
31 while(pStr1 != pStr2) // 替换结束的条件
32 {
33 if(*pStr1==' ')
34 {
35 *pStr2--='0';
36 *pStr2--='2';
37 *pStr2--='%';
38 }
39 else
40 {
41 *pStr2--=*pStr1;
42 }
43 --pStr1;
44 }
45 }
46 };
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