# Time:  O(n), n is the length of the source
# Space: O(k), k is the max length of a line

class Solution(object):
    def removeComments(self, source):
        """
        :type source: List[str]
        :rtype: List[str]
        """
        in_block = False
        result, newline = [], []
        for line in source:
            i = 0
            while i < len(line):
                if not in_block and i+1 < len(line) and line[i:i+2] == '/*':
                    in_block = True
                    i += 1
                elif in_block and i+1 < len(line) and line[i:i+2] == '*/':
                    in_block = False
                    i += 1
                elif not in_block and i+1 < len(line) and line[i:i+2] == '//':
                    break
                elif not in_block:
                    newline.append(line[i])
                i += 1
            if newline and not in_block:
                result.append("".join(newline))
                newline = []
        return result