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pivot index

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Silly Skimmer answered on October 17, 2021 Popularity 9/10 Helpfulness 2/10

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pivot index

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# Time:  O(n)
# Space: O(1)

class Solution(object):
    def pivotIndex(self, nums):
        """
        :type nums: List[int]
        :rtype: int
        """
        total = sum(nums)
        left_sum = 0
        for i, num in enumerate(nums):
            if left_sum == (total-left_sum-num):
                return i
            left_sum += num
        return -1

Popularity 9/10 Helpfulness 2/10 Language python

Source: shareablecode.com

Tags: pivot python

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Contributed on Aug 17 2022

Silly Skimmer

0 Answers Avg Quality 2/10

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pivot index

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var pivotIndex = function(nums) {
    // Initialize total sum of the given array...
    let totalSum = 0
    // Traverse the elements and add them to store the totalSum...
    for(let i = 0; i < nums.length; i++) {
        totalSum += nums[i]
    }
    // Initialize 'leftsum' as sum of first i numbers, not including nums[i]...
    let leftSum = 0
    // Again traverse all the elements through the for loop and store the sum of i numbers from left to right...
    for (let i = 0; i < nums.length; i++) {
        // sum to the left == leftsum.
        // sum to the right === totalSum - leftsum - nums[i]..
        // check if leftsum == totalSum - leftsum - nums[i]...
        if (leftSum * 2 == totalSum - nums[i])
            return i;       // Return the pivot index...
        leftSum += nums[i]
    }
    return -1      // If there is no index that satisfies the conditions in the problem statement...
};
console.log(pivotIndex([1,7,3,6,5,6]));

Popularity 9/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Nov 27 2022

Mohammad alshraideh

0 Answers Avg Quality 2/10

pivot_table indexing

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table = pd.pivot_table(df, values='D', index=['A', 'B'],
...                     columns=['C'], aggfunc=np.sum, fill_value=0)
>>> table
C        large  small
A   B
bar one      4      5
    two      7      6
foo one      4      1
    two      0      6

Popularity 9/10 Helpfulness 1/10 Language python

Source: pandas.pydata.org

Tags: python py

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Contributed on Oct 17 2021

Tense Tarsier

0 Answers Avg Quality 2/10

pivot index

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