oj.h is a Online Judge Toolkit to speed-up your problem solving.

oj.h is a template library containing a batch of basic algrithms and data structures with cin/cout support (for debug purpose).

Donwload this repo and include oj.h in your program, All OJ templates are available in oj namespace. For example, vector reading and printing:

#include "oj.h"
using namespace oj;

int main() {
    vector<int> v;
    // input: 2 1 3 4
    cin >> v;
    // output: [2,1,3,4]
    cout << v << endl;
    return 0;
}

All functionalities are provided via C++ template, so there's no need to build this lib.

With oj.h, you can declare and read-in a variable in a single line.

// equivalent to: int x; cin>>x;
int x = get<int>();
// equivalent to: int str; cin>>str;
string str = get<string>();

vector template is provided by STL. While oj.h provides cin and cout:

vector<int> v;
// input: 1 3 2
cin >> v;
// output: [1,3,2]
cout << v << endl;

cin and cout for pair:

pair<int, char> p;
// input: 1 a
cin >> p;
// output: <1,a>
cout << p << endl;

cin and cout for map:

map<int, char> mp;
// input: 1 a 2 b 3 c
cin >> mp;
// output: {<1,a>,<2,b>,<3,c>}
cout << mp << endl;

cin and cout for set:

set<int> st;
// input: 2 3 1
cin >> st;
// output: {1,2,3}
cout << st << endl;

LinkList is a basic link list implementation with cout support.

LinkList<int>* head = new LinkList<int>();
head->next = new LinkList<int>(1);
head->next->next = new LinkList<int>(2);

// output: 0->1->2
cout << head << endl;

Tree is a basic binary tree implementation.

cout of tree nodes follows DFS order, # indicates NULL.

Tree<int>* root = new Tree<int>();
root->left = new Tree<int>(1);
root->right = new Tree<int>(2);
root->right->left = new Tree<int>(3);
root->right->right = new Tree<int>(4);
// output: 0 1 # # 2 3 # # 4 # #
cout << *root << endl;

algos/ directory contains basic algrithms:

• quicksort: Quick sort, random pivot enhanced.
• mergesort: Merge sort.

Go to test/ directory and run make. All test cases will be compiled and executed with corresponding input.

All contributions are welcome. You can either provide more algrithms in algos/ directory, or provide additional functionalities in lib/ directory.

All OJ functionalities should be in oj namespace.