My C++ utility code

templ.cpp

#include <vector>
#include <iostream>
#include <algorithm>
#include <stack>
#include <assert.h>
#include <queue>

using namespace std;

namespace util {
  
  // Print a message and vector contents
  template<typename T>
  void print_vec(std::string message, std::vector<T> & vec) {
    std::cout << message << " -> ";
    for (auto item : vec) {
      std::cout << item << ",";
    }
    cout << "\n";
  }
  
} //end namespace util


// ************ Data Structures
struct TreeNode {
  int val;
  TreeNode *left;
  TreeNode *right;
  TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
};

struct TreeLinkNode {
  int val;
  TreeLinkNode *left, *right, *next;
  TreeLinkNode(int x) : val(x), left(NULL), right(NULL), next(NULL) {}
};

// ************* End of Data Structures

class Solution {
public:
  void solve() {}
};

int main() {
  Solution s;
  
  // impl
  
  return 0;
}