JAVA

sum of 1D array(JAVA)

import java.util.Arrays;
import java.util.Scanner;

public class LeetCode_RunningSum {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        int[] arr = {1,2,3,4};

        System.out.println(Arrays.toString(out(arr)));

    }

    static int[] out(int[] nums){

        int sum = 0;
        int[] arr = new int[nums.length];

        for (int i = 0; i < nums.length; i++){
            sum += nums[i];
            arr[i] = sum;
        }

        return arr;
    }
}

Running Sum of 1d Array Java

class Solution {
    public int[] runningSum(int[] nums) {
    int[] ans = new int[nums.length];
    ans[0] = nums[0];
    for (int i = 1; i < nums.length; i++)
        ans[i] = ans[i-1] + nums[i];
    return ans;
    }
}

java running sum of array

class Solution {
    public int[] runningSum(int[] nums) {
        int[] sol = new int[nums.length];
        sol[0] = nums[0];
        for(int i = 1; i < nums.length; i++) {
            sol[i] = sol[i-1] + nums[i];
        }
        return sol;
    }
}

// Example: runningSum([1,3,6,9]) = [1, 4, 10, 19] = [1, 1+3, 1+3+6, 1+3+6+9]