Merge pull request #7 from tkzzzzzz6/auto-fix-missing-headers-20260408

Auto fix missing headers 20260408

Author: tkzzzzzz6

leetcode/Study Plan/3432. 统计元素和差值为偶数的分区方案/1.cpp

@@ -1,5 +1,13 @@
+#include <vector>
+#include <numeric>
 class Solution {
     public:
+        /**
+         * @brief Compute a partition-count value determined by whether the sum of `nums` is odd or even.
+         *
+         * @param nums Input vector of integers whose elements are summed.
+         * @return int `0` if the total sum of `nums` is odd; otherwise `nums.size() - 1` (which is `-1` for an empty vector).
+         */
         int countPartitions(vector<int>& nums) {
             int sum = reduce(nums.begin(),nums.end());
             return sum % 2 ? 0 : nums.size() - 1;