题解 | #替换空格#

class Solution {
public:
    string replaceSpace(string s) {
        // write code here
        int count = 0;
        for (auto str : s){
            if (str == ' ')
                count++;
        }
        int len = s.size();
        s.resize(s.size() + count * 2);
        for (int i = s.size() - 1; i >= 0; i--){
            if (s[len - 1] == ' '){
                s[i] = '0';
                s[i - 1] = '2';
                s[i - 2] = '%';
                i -= 2;
            }
            else 
                s[i] = s[len - 1];
            len--;
        }
        return s;
    }
};