[英]Node JS displaying value at index instead of indices
Written this 2sums code to get efficent O(N)
Time complexity algorithm for below problem编写此 2sums 代码以获得以下问题的有效O(N)
时间复杂度算法
Input: nums = [2,7,11,15], target = 9
Output: [0,1]
Output: Because nums[0] + nums[1] == 9, we return [0, 1].
unfortunately saw value at array nums
got displayed in the output,whereas the need is to get the indices
to be displayed in output不幸的是,数组nums
的值显示在 output 中,而需要让indices
显示在 output 中
What change needs to be done below下面需要做哪些改变
let hashTwoSum = (array, sum) => {
let numsObj = {}
let nums = []
for(let i in array){
let addend = sum - array[i]
if (addend in numsObj){
nums.push([addend, array[i]])
}
numsObj[array[i]] = i
}
return nums
}
let array = [2,7,11,15]
console.log(hashTwoSum(array,9))
Your help is appreciated感谢您的帮助
Regards,问候,
Carolyn卡罗琳
As @jriend00 said, do not use for(... in...)
loop for iterating arrays.正如@jriend00 所说,不要使用for(... in...)
循环来迭代 arrays。 But in your case, where you need indices, you need to use the good old for
loop: for(let i = 0; i < array.length; i++)
.但是在您需要索引的情况下,您需要使用旧for
循环: for(let i = 0; i < array.length; i++)
。 And when you save results, you need to push both indices : nums.push([numsObj[addend], i])
.当您保存结果时,您需要推送两个索引: nums.push([numsObj[addend], i])
。
Here's a complete example:这是一个完整的例子:
let hashTwoSum = (array, sum) => {
let numsObj = {}
let nums = []
for(let i = 0; i < array.length; i++){
let addend = sum - array[i]
if (addend in numsObj){
nums.push([numsObj[addend], i])
}
numsObj[array[i]] = i
}
return nums
}
let array = [2,7,11,15,6]
console.log(hashTwoSum(array,17))
This will output:这将 output:
[ [ 0, 3 ], [ 2, 4 ] ]
because 2 + 15 and 11 + 6 are both equal 17.因为 2 + 15 和 11 + 6 都等于 17。
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