Introduction

Here the problem says, what we have to do is, we have to store the sum of values form 0 to running index. Like if we want is ans[3] = num[0]+num[1]+num[2]+num[3]; same goes for other index of ans.

Examples

Steps

• ans[0] = num[0]
• take a for loop, which starts from 1 and ends to nums.length
• ans[i] = ans[i-1] + num[i]
• return the value.

Code

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

Output