problem0303

README

303. Range Sum Query - Immutable

题目

Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive.

Example:

Given nums = [-2, 0, 3, -5, 2, -1]

sumRange(0, 2) -> 1
sumRange(2, 5) -> -1
sumRange(0, 5) -> -3

Note:

1. You may assume that the array does not change.
2. There are many calls to sumRange function.

解题思路

见程序注释

Documentation

Index

• type NumArray
  • func Constructor(nums []int) NumArray
  • func (na *NumArray) SumRange(i int, j int) int

Types

type NumArray

type NumArray struct {
	// contains filtered or unexported fields
}

NumArray 是切片的和切片

func Constructor

func Constructor(nums []int) NumArray

Constructor 返回 NumArray

func (*NumArray) SumRange

func (na *NumArray) SumRange(i int, j int) int

SumRange (i,j) == sum(nums[i:j+1])