Challenge

Givin an array, return the number of odd-sum of sub arrays.

For more explanation see leetcode challenge.

My approaches

1. First

    def numOfSubarrays(self, arr: List[int]) -> int:
        subs = [ 
            sum( arr[ i : j+1 ] ) …

In python sort can be made with list.sort() or sorted(). The former is method of list and the latter is

Differences between the former and the latter are

Both have keyword arguments, key and reverse. key takes function to …

This coding challenge appeared in Leetcode April coding contest.

Caveats of this challenge
1. that index starts from 1
2. that cycle keeps chaning

I tried something like this but mine didn't pass the test, because I didn't take care of chaning cycle.

    def findTheWinner(self, n: …

In python for loop has fixed number of iteration unless specified otherwise.

Below is a common for loop.

nums = range(5)

for i in nums:
    print(i)

It will print five numbers.

In while loop you can maniuplate number of iteration by changing index. …

Instead of using setState of react, state management can be handled with mapDispatchToProps in redux.

import React from 'react';
import { connect, Provider } from 'react-redux'
import { createStore } from 'redux'

// Redux:
const ADD = 'ADD';

const addMessage = (message) => { …