From 295795c04170e2b40317c5cad60af750e3911cb3 Mon Sep 17 00:00:00 2001
From: Mistivia <i@mistivia.com>
Date: Wed, 3 Sep 2025 16:32:07 +0800
Subject: solve 66

---
 c/0066/main.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 c/0066/main.c

diff --git a/c/0066/main.c b/c/0066/main.c
new file mode 100644
index 0000000..b01eb8b
--- /dev/null
+++ b/c/0066/main.c
@@ -0,0 +1,38 @@
+#include <stdlib.h>
+
+// begin
+
+/**
+ * Note: The returned array must be malloced, assume caller calls free().
+ */
+int* plusOne(int* digits, int digitsSize, int* returnSize) {
+    int *buffer = malloc((digitsSize + 1) * sizeof(int));
+    for (int i = 0; i < digitsSize; i++) {
+        buffer[i] = digits[digitsSize - 1 - i];
+    }
+    buffer[0]++;
+    int carry = 0;
+    for (int i = 0; i < digitsSize; i++) {
+        int val = buffer[i] + carry;
+        carry = val / 10;
+        buffer[i] = val % 10;
+    }
+    int len = digitsSize;
+    if (carry) {
+        len++;
+        buffer[digitsSize] = 1;
+    }
+    int lp = 0, rp = len - 1;
+    while (lp <= rp) {
+        int t = buffer[lp];
+        buffer[lp] = buffer[rp];
+        buffer[rp] = t;
+        lp++;
+        rp--;
+    }
+    *returnSize = len;
+    return buffer;
+}
+
+// end
+
-- 
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