LeetCode || Reverse Words in a String

class Solution {
public:
void reverse(string& str, int s, int e)
{
if(s > e)
return;

for(int i = s;i<=(s+e)/2 ;i++)
{
char tmp = str[i];
str[i] = str[e-i+s];
str[e-i+s] = tmp;
}
}

void RemoveBlank(string& s)//移除string s前后的所有空格。
{
if(s.empty())
return;
s.erase(0,s.find_first_not_of(" "));
s.erase(s.find_last_not_of(" ") + 1);
}

void reverseWords(string &s) {

RemoveBlank(s);//去除两端空格

reverse(s, 0, s.size()-1);

int i = 0, j = 0;

while(1)
{
i = j;
while(i < s.size() && s[i] == ' ')
i++;

if(i >= s.size())
break;

if(i-j-1>0)//需要移除中间的空格，每个words之间只允许有一个空格
{
s.erase(j, i-j-1); //erase后i与j的位置应该发生改变
i =  j+1;
}
j = i;
while(j < s.size() && s[j]!=' ')
j++;

reverse(s, i, j-1);
}
}
};