Contents
How to count all sub-arrays given sum zero?
Given array of random numbers (positive, and negative) with length n, I want number contiguous sub-arrays which sum equals zero. Example: Given I have array a= {1, -1 ,2 , -2, 6, -6}, output will be 6 because sub-arrays are as the following:
How to find subarray with given sum with negatives?
If curr_sum becomes equal to the target sum, then print the solution. If curr_sum exceeds the sum, then remove the trailing elements while decreasing curr_sum is greater than the sum and keep decreasing the target sum by abs (minimum element).
How to count the number of occurrences in a subarray?
Let s0., sn be the prefix sums defined by sj = a1 + + aj (and s0 = 0). The sum of the subarray from i to j inclusive is sj – si-1. For an O (n)/O (n log n)-time algorithm, using a map, count the number of occurrences of each number among the prefix sums.
How to print the largest sum contiguous subarray?
Following is another simple implementation suggested by Mohit Kumar. The implementation handles the case when all numbers in the array are negative. echo “Maximum contiguous sum is ” . To print the subarray with the maximum sum, we maintain indices whenever we get the maximum sum.
How to find sum of perfect square elements in an array?
C Program to find sum of perfect square elements in an array using pointers. We are given with an array of N elements. The goal is to find the count of all pairs (Arr [i],Arr [j]) which have a sum which is a perfect square such that i!=j. That is Arr [i]+Arr [j] is a perfect square.
How to calculate the sum of all subarrays?
A simple solution would be to generate all possible subarrays. While traversing, keep track of the subarray sum. Keep a count of all subarrays whose sum is a perfect square. Efficient Solution: The idea is to use a prefix sum array to solve the given problem.
How to calculate the sum of pairs in an array?
Naive Approach: Use nested loops and check every possible pair for whether their sum is a perfect square or not. This technique is not effective when the length of the array is very large. Store all the elements of the array in a HashSet named nums and save the sum of the maximum two elements in a variable named max.