```
# Definition for an interval.
# class Interval(object):
# def __init__(self, s=0, e=0):
# self.start = s
# self.end = e
class Solution(object):
def merge(self, intervals):
"""
:type intervals: List[Interval]
:rtype: List[Interval]
"""
if not intervals:
return intervals
intervals = sorted(intervals, key=lambda x: x.start)
answer = [intervals[0]]
for interval in intervals[1:]:
if interval.start <= answer[-1].end:
if interval.end > answer[-1].end:
answer[-1].end = interval.end
else:
answer.append(interval)
return answer
```