can anyone help me why the program also meet time limited issue when submit

```
class Solution(object):
fResult = []
def saveResult(self,rlist,candidates):
tmp = []
for i in (xrange(len(rlist))):
for j in xrange(rlist[i]):
tmp.append(candidates[i])
tmp.sort()
self.fResult.append(tmp)
def myhelper(self, left, idxArray, candidates, rList):
if (idxArray == len(candidates)):
return
cnt = left / candidates[idxArray]
if cnt == 0:
return
for i in reversed((xrange(cnt + 1))):
subleft = left - i * candidates[idxArray]
rList.append(i)
if (subleft) :
self.myhelper(subleft, idxArray + 1, candidates, rList)
else :
self.saveResult(rList, candidates)
rList.pop()
def combinationSum(self, candidates, target):
"""
:type candidates: List[int]
:type target: int
:rtype: List[List[int]]
"""
left = target
rList = []
candidates.sort()
self.myhelper(left, 0, candidates, rList)
self.fResult.sort()
return self.fResult
```