New problem done

701/main.c

@@ -0,0 +1,66 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+struct TreeNode {
+    int val;
+    struct TreeNode *left;
+    struct TreeNode *right;
+};
+
+void insertIntoBSTRecursively(struct TreeNode*, int);
+
+struct TreeNode* insertIntoBST(struct TreeNode* root, int val) {
+    insertIntoBSTRecursively(root, val);
+    return root;
+}
+
+void insertIntoBSTRecursively(struct TreeNode* tree, int val) {
+    if (val < tree->val) {
+        // Go left if possible
+        // else append a new TreeNode with this value
+        if (tree->left != NULL) {
+            insertIntoBSTRecursively(tree->left, val);
+        } else {
+            struct TreeNode *t = malloc(sizeof(struct TreeNode));
+            t->val = val;
+            t->left = NULL;
+            t->right = NULL;
+            tree->left = t;
+        }
+    } else {
+        // Go right if possible
+        // else append a new TreeNode with this value
+        if (tree->right != NULL) {
+            insertIntoBSTRecursively(tree->right, val);
+        } else {
+            struct TreeNode *t = malloc(sizeof(struct TreeNode));
+            t->val = val;
+            t->left = NULL;
+            t->right = NULL;
+            tree->right = t;
+        }
+    }
+}
+
+int main() {
+    struct TreeNode *t2 = malloc(sizeof(struct TreeNode));
+    t2->val = 2;
+    t2->left = NULL;
+    t2->right = NULL;
+    struct TreeNode *t3 = malloc(sizeof(struct TreeNode));
+    t3->val = 3;
+    t3->left = NULL;
+    t3->right = NULL;
+    struct TreeNode *t = malloc(sizeof(struct TreeNode));
+    t->val = 1;
+    t->left = t2;
+    t->right = t3;
+    printf("Expecting to add value `4` to tree...\n");
+    insertIntoBST(t, 4);
+    // Here check t contains 4 now.
+    if (t->right->right->val == 4) {
+        printf("Value `4` added to Tree!\n");
+        return 0;
+    }
+    return -1;
+}

701/problem.txt

@@ -0,0 +1,3 @@
+Given the root node of a binary search tree (BST) and a value to be inserted into the tree, insert the value into the BST. Return the root node of the BST after the insertion. It is guaranteed that the new value does not exist in the original BST.
+
+Note that there may exist multiple valid ways for the insertion, as long as the tree remains a BST after insertion. You can return any of them.

701/run.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+gcc -o main main.c
+./main