Sage-Tips

How do you count positive and negative numbers in an array?

Approach:

1. Traverse the elements in the array one by one.
2. For each element, check if the element is less than 0. If it is, then increment the count of negative elements.
3. For each element, check if the element is greater than 0.
4. Print the count of negative and positive elements.

How do you find the maximum sum of an array?

Find the Maximum subarray sum using Kadane’ Algorithm. Keep that subarray intact and multiply the rest with -1. Considering the sum of the whole array as S, and the largest sum contiguous subarray as S1, the total sum will be equal to -(S-S1) + S1 = 2*S1 – S. This is the required sum.

How do you know if an array is sequential order?

Solution

1. Find minimum and maximum element in the array.
2. Check if max-min+1==n, if elements are consecutive then this condition should meet.
3. Create a visited boolean array.
4. Iterate over the array and check. visited[arr[i]-min] is true, then return false as elements are repeated. mark the element visited.

How do you find the maximum subarray of an array?

Simple Approach:

1. Run a loop for i from 0 to n – 1, where n is the size of the array.
2. Now, we will run a nested loop for j from i to n – 1 and add the value of the element at index j to a variable currentMax.
3. Lastly, for every subarray, we will check if the currentMax is the maximum sum of all contiguous subarrays.

How do you find positive numbers in an array?

To find out positive numbers from array: we check each number, if number is greater than or equal to zero then it will be a positive number. We traverse array of integer, if it is positive number then we will print that number of console.

How do you count zeros in an array?

Count all zeros in the array To count all the zeros in an array, simply use the np. count_nonzero() function checking for zeros. It returns the count of elements inside the array satisfying the condition (in this case, if it’s zero or not).

What is largest continuous sum?

This is one of the most common interview practice questions. Given an array of integers (positive and negative) find the largest continuous sum. If the array is all positive, then the result is simply the sum of all numbers. The negative numbers in the array slightly complicate things.

How do you find consecutive numbers in an array?

For an array to contain consecutive integers,

1. The difference between the maximum and minimum element in it should be exactly n-1 .
2. All elements in the array should be distinct (we can check this by inserting the elements in a set or using a visited array).

How do you compare consecutive elements in an array?

Method 1 (Use Sorting) 1) Sort all the elements. 2) Do a linear scan of the sorted array. If the difference between the current element and the next element is anything other than 1, then return false. If all differences are 1, then return true.

How do you find the subarray of an array?

Algorithm:

1. Traverse the array from start to end.
2. From every index start another loop from i to the end of array to get all subarray starting from i, keep a variable sum to calculate the sum.
3. For every index in inner loop update sum = sum + array[j]
4. If the sum is equal to the given sum then print the subarray.

How do you solve Subarray problems?

Simple idea → Traverse through all of the possible subarrays, find their individual sum and then finally add them up to find the total sum. This will take time complexity of O(n^3). O(n^2) for all the possible subarrays and one pass through each subarray to find the sum of it. So the total will be O(n^3).