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search_range.py
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search_range.py
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import json
class Solution(object):
def binary_find(self, arr, target):
if len(arr) <= 1:
if len(arr) == 1 and arr[0] == target:
return 0
else:
return -1
mid_pos = len(arr)/2
if arr[mid_pos] == target:
return mid_pos
left = self.binary_find(arr[:mid_pos],target)
if left != -1:
return left
right = self.binary_find(arr[mid_pos+1:],target)
if right != -1:
return mid_pos+1+right
return -1
def find_first(self, nums, target, left, right):
if left == right:
return left
if left+1 == right:
return left if nums[left]==target else right
mid = (left+right)/2
if nums[mid] == target:
return self.find_first(nums,target,left,mid)
else:
return self.find_first(nums,target,mid+1,right)
def find_last(self, nums, target, left, right):
if left == right:
return right
if left+1 == right:
return right if nums[right]==target else left
mid = (left+right)/2
if nums[mid] == target:
return self.find_last(nums,target,mid,right)
else:
return self.find_last(nums,target,left,mid-1)
def searchRange(self, nums, target):
"""
:type nums: List[int]
:type target: int
:rtype: List[int]
"""
# step1-find the one target pos
one_pos = self.binary_find(nums, target)
if one_pos == -1:
return [-1,-1]
# step2-find start of the target
start = self.find_first(nums,target,0,one_pos)
# step3-find end of the target
end = self.find_last(nums,target,one_pos,len(nums)-1)
return [start,end]
def stringToIntegerList(input):
return json.loads(input)
def stringToInt(input):
return int(input)
def integerListToString(nums, len_of_list=None):
if not len_of_list:
len_of_list = len(nums)
return json.dumps(nums[:len_of_list])
def main():
import sys
def readlines():
for line in sys.stdin:
yield line.strip('\n')
lines = readlines()
while True:
try:
line = lines.next()
nums = stringToIntegerList(line)
line = lines.next()
target = stringToInt(line)
ret = Solution().searchRange(nums, target)
out = integerListToString(ret)
print out
except StopIteration:
break
if __name__ == '__main__':
main()