Add 1448 in c language

Author: julienChemillier

c/1448-Count-Good-Nodes-in-Binary-Tree.c

@@ -0,0 +1,18 @@
+/*
+Given a binary tree root, a node X in the tree is named good if in the path from root to X there are no nodes with a value greater than X.
+Return the number of good nodes in the binary tree.
+Time: O(n)
+Space: O(log(h)) Where h is the height of the tree
+*/
+
+int nbGood(struct TreeNode* root, int m) {
+    if (root==NULL)
+        return 0;
+    if (root->val >= m)
+        return 1+nbGood(root->left, root->val)+nbGood(root->right, root->val);
+    return nbGood(root->left, m)+nbGood(root->right, m);
+}
+
+int goodNodes(struct TreeNode* root){
+    return nbGood(root, INT_MIN);
+}