go: add «100. Same Tree»

Signed-off-by: Matej Focko <mfocko@redhat.com>

go/same-tree.go

@@ -0,0 +1,23 @@
+package same_tree
+
+/**
+ * Definition for a binary tree node.
+ * type TreeNode struct {
+ *     Val int
+ *     Left *TreeNode
+ *     Right *TreeNode
+ * }
+ */
+func isSameTree(p *TreeNode, q *TreeNode) bool {
+	// at least one is nil
+	if p == nil || q == nil {
+		return p == q
+	}
+
+	// different values
+	if p.Val != q.Val {
+		return false
+	}
+
+	return isSameTree(p.Left, q.Left) && isSameTree(p.Right, q.Right)
+}