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apps/docs/content/array/1480-running-sum-of-1d-array.mdx

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+---
+title: '1480. Running Sum of 1d Array'
+description: Given an array nums. We define a running sum of an array as runningSum[i] = sum(nums[0]…nums[i])
+sidebar:
+  label: 'Running Sum of 1d Array'
+  badge: 'Easy'
+---
+
+<Badge variant="accent">Array</Badge>
+
+### Example 1:
+- Input: `nums = [1,2,3,4]`
+- Output: `[1,3,6,10]`
+- Explanation: Running sum is obtained as follows: `[1, 1+2, 1+2+3, 1+2+3+4]`.
+
+### Example 2:
+- Input: `nums = [1,1,1,1,1]`
+- Output: `[1,2,3,4,5]`
+- Explanation: Running sum is obtained as follows: `[1, 1+1, 1+1+1, 1+1+1+1, 1+1+1+1+1]`.
+
+### Example 3:
+- Input: `nums = [3,1,2,10,1]`
+- Output: `[3,4,6,16,17]`
+
+### Constraints:
+
+- `1 <= nums.length <= 1000`
+- `-10^6 <= nums[i] <= 10^6`
+
+## Approach
+
+```mermaid
+flowchart TD
+  S(["runningSum(nums)"]) --> I["prefix = [nums[0]]"]
+  I --> L{"more i in 1..n-1?"}
+  L -- yes --> P["prefix.push(prefix[i-1] + nums[i])"]
+  P --> L
+  L -- no --> E(["return prefix"])
+```
+
+## Solution
+
+```js
+/**
+ * @param {number[]} nums
+ * @return {number[]}
+ */
+var runningSum = function(nums) {
+  let prefix = [nums[0]];
+  for (let i = 1; i < nums.length; i++){
+    prefix.push(prefix[i - 1] + nums[i]);
+  }
+  return prefix;
+};
+```