2 sum soltution using dict(hashmap) in python .

class Solution(object):

def twoSum(self, nums, target):

"""

:type nums: List[int]

:type target: int

:rtype: List[int]

here we can do brute force .

for i in range of len(nums) ;

target =[]

hashmap as dict here we are using it

"""

hashmap ={} #here we are initializiing the dictionary

for i,num in enumerate(nums):

hashmap[num]=i

for i ,num in enumerate(nums):

x=target-num

if x in hashmap and hashmap[x] != i:

return [i,hashmap[x]]

return []

hashmap ={} #here we are initializiing the dictionary

for i ,num in enumerate(nums):

x=target-num

if x in hashmap and hashmap[x] != i:

return [i,hashmap[x]]

hashmap[num]=i

return []