message: Update combination-sum-iv.cpp
diff: class Solution {
  public:
  int combinationSum4(vector<int>& nums, int target) {
  - vector<int> dp(target + 1, 0);
  + vector<uint32_t> dp(target + 1, 0);
  dp[0] = 1;
  sort(nums.begin(), nums.end());
  