57. Insert Interval

class Solution:
    def insert(self, intervals: List[List[int]], newInterval: List[int]) -> List[List[int]]:
        res = []
        i = -1
        for i, (x, y) in enumerate(intervals):
            if y < newInterval[0]:
                res.append([x, y])
            elif newInterval[1] < x:
                i -= 1
                break
            else:
                newInterval[0] = min(newInterval[0], x)
                newInterval[1] = max(newInterval[1], y)

        return res + [newInterval] + intervals[i+1:]