Commit 44d46ca

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Shuo

authored

Merge pull request #501 from openset/develop

Add: Range Sum of BST

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Lines changed: 24 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -1 +1,25 @@`
`1`	`1`	`package range_sum_of_bst`
	`2`	`+`
	`3`	`+import . "github.com/openset/leetcode/internal/kit"`
	`4`	`+`
	`5`	`+/**`
	`6`	`+ * Definition for a binary tree node.`
	`7`	`+ * type TreeNode struct {`
	`8`	`+ * Val int`
	`9`	`+ * Left *TreeNode`
	`10`	`+ * Right *TreeNode`
	`11`	`+ * }`
	`12`	`+ */`
	`13`	`+func rangeSumBST(root *TreeNode, L int, R int) int {`
	`14`	`+ ans := 0`
	`15`	`+ if root.Val >= L && root.Val <= R {`
	`16`	`+ ans += root.Val`
	`17`	`+ }`
	`18`	`+ if root.Left != nil && root.Val > L {`
	`19`	`+ ans += rangeSumBST(root.Left, L, R)`
	`20`	`+ }`
	`21`	`+ if root.Right != nil && root.Val < R {`
	`22`	`+ ans += rangeSumBST(root.Right, L, R)`
	`23`	`+ }`
	`24`	`+ return ans`
	`25`	`+}`

Lines changed: 36 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -1 +1,37 @@`
`1`	`1`	`package range_sum_of_bst`
	`2`	`+`
	`3`	`+import (`
	`4`	`+ "testing"`
	`5`	`+`
	`6`	`+ . "github.com/openset/leetcode/internal/kit"`
	`7`	`+)`
	`8`	`+`
	`9`	`+type caseType struct {`
	`10`	`+ input []int`
	`11`	`+ l int`
	`12`	`+ r int`
	`13`	`+ expected int`
	`14`	`+}`
	`15`	`+`
	`16`	`+func TestRangeSumBST(t *testing.T) {`
	`17`	`+ tests := [...]caseType{`
	`18`	`+ {`
	`19`	`+ input: []int{10, 5, 15, 3, 7, NULL, 18},`
	`20`	`+ l: 7,`
	`21`	`+ r: 15,`
	`22`	`+ expected: 32,`
	`23`	`+ },`
	`24`	`+ {`
	`25`	`+ input: []int{10, 5, 15, 3, 7, 13, 18, 1, NULL, 6},`
	`26`	`+ l: 6,`
	`27`	`+ r: 10,`
	`28`	`+ expected: 23,`
	`29`	`+ },`
	`30`	`+ }`
	`31`	`+ for _, tc := range tests {`
	`32`	`+ output := rangeSumBST(SliceInt2TreeNode(tc.input), tc.l, tc.r)`
	`33`	`+ if output != tc.expected {`
	`34`	`+ t.Fatalf("input: %v, output: %v, expected: %v", tc.input, output, tc.expected)`
	`35`	`+ }`
	`36`	`+ }`
	`37`	`+}`

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