722. Remove Comments

class Solution {
public:
    vector<string> removeComments(vector<string>& source) {
        vector<string> res;
        string ln;
        int state = 0;
        for (const auto & line : source) {
            for (int i = 0, ll = line.length(); i < ll; i++) {
                if (state == 0) {
                    if (i < ll-1) {
                        if (line[i] == '/' && line[i+1] == '/')
                            break;  // // comment, skip line
                        else if (line[i] == '/' && line[i+1] == '*') {
                            state = 1;
                            i += 1;
                            continue;
                        }
                    }
                    ln.push_back(line[i]);
                }
                else if (state == 1) {  // inside /*
                    if (i < ll-1 && line[i] == '*' && line[i+1] == '/') {
                        state = 0;
                        i += 1;
                        continue;
                    }
                }
            }
            if (state == 0 && ln.length() > 0) {
                res.push_back(ln);
                ln = "";
            }
        }
        if (ln.length() > 0)
            res.push_back(ln);
        return res;
    }
};