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Add: construct_string_from_binary_tree #163

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Merged
merged 1 commit into from
Jan 7, 2019
Merged

Add: construct_string_from_binary_tree #163

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20 changes: 18 additions & 2 deletions problems/construct-string-from-binary-tree/construct_string_from_binary_tree.go
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Original file line number Diff line number Diff line change
@@ -1,6 +1,10 @@
package construct_string_from_binary_tree

import . "github.com/openset/leetcode/internal/kit"
import (
"strconv"

. "github.com/openset/leetcode/internal/kit"
)

/**
* Definition for a binary tree node.
Expand All @@ -11,5 +15,17 @@ import . "github.com/openset/leetcode/internal/kit"
* }
*/
func tree2str(t *TreeNode) string {
return ""
ans := ""
if t != nil {
ans += strconv.Itoa(t.Val)
if t.Left != nil {
ans += "(" + tree2str(t.Left) + ")"
} else if t.Right != nil {
ans += "()"
}
if t.Right != nil {
ans += "(" + tree2str(t.Right) + ")"
}
}
return ans
}
4 changes: 2 additions & 2 deletions problems/construct-string-from-binary-tree/construct_string_from_binary_tree_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -15,11 +15,11 @@ func TestTree2str(t *testing.T) {
tests := [...]caseType{
{
input: []int{1, 2, 3, 4},
expected: "",
expected: "1(2(4))(3)",
},
{
input: []int{1, 2, 3, NULL, 4},
expected: "",
expected: "1(2()(4))(3)",
},
}
for _, tc := range tests {
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