leetcode

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1480. Running Sum of 1d Array

题目

Given an array nums. We define a running sum of an array as runningSum[i] = sum(nums[0]…nums[i]).

Return the running sum of nums.

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

题目大意

给你一个数组 nums 。数组「动态和」的计算公式为：runningSum[i] = sum(nums[0]…nums[i]) 。请返回 nums 的动态和。

解题思路

• 简单题，按照题意依次循环计算前缀和即可。

代码

package leetcode

func runningSum(nums []int) []int {
	dp := make([]int, len(nums)+1)
	dp[0] = 0
	for i := 1; i <= len(nums); i++ {
		dp[i] = dp[i-1] + nums[i-1]
	}
	return dp[1:]
}