1 files changed, 9 insertions, 0 deletions
diff --git a/0100/main.c b/0100/main.c
index 22f36b0..a27b167 100644
--- a/0100/main.c
+++ b/0100/main.c
@@ -1,3 +1,12 @@
+#include <stdbool.h>
+#include <stdlib.h>
+
+struct TreeNode {
+    int val;
+    struct TreeNode *left;
+    struct TreeNode *right;
+};
+
 /**
  * Definition for a binary tree node.
  * struct TreeNode {