Given an array of integers, return indices of the two numbers such that they add up to a specific target.
You may assume that each input would have exactly one solution, and you may not use the same element twice.
Example:
Given nums = [2, 7, 11, 15], target = 9,
Because nums[0] + nums[1] = 2 + 7 = 9,
return [0, 1].
思路:两个数的和一定(target),如果一个其中一个数字固定,那另一个数字也就固定了。
所以我用for循环,每次先固定一个数,再用index方法寻找另一个。(不能重复)
class Solution(object):
def twoSum(self, nums, target):
"""
:type nums: List[int]
:type target: int
:rtype: List[int]
"""
for i,val in enumerate(nums):
retarget = target - val
if retarget in nums and nums.index(retarget) != i:
j = nums.index(retarget)
return [i,j]
两数之和算法解析
本文探讨了如何在一个整数数组中找到两个数,使它们的和等于特定目标值。通过固定一个数字并查找其配对数字的方法,实现了一种有效的解决方案。避免使用相同元素两次,确保了每个输入都有唯一解。
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