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Track A

C++ Fundamentals

Syntax, rules, STL, complexity and debug habits — taught before you open the judge.

  1. 01~12 min · 2 quiz questionsC++ Setup, Hello & I/OHow a C++ program runs, iostream, cin/cout, competitive programming fast I/O.
  2. 02~15 min · 1 quiz questionTypes, Variables & Operatorsint vs long long, bool, char, overflow traps, and operator basics.
  3. 03~14 min · 1 quiz questionif / for / while — Control FlowLoops, early returns, and the patterns you reuse in every DSA solution.
  4. 04~16 min · 1 quiz questionFunctions, Classes & Pass-by-ReferenceHow LeetCode Solution classes work, and why we pass vectors by reference.
  5. 05~18 min · 1 quiz questionvector — Your Default Arraysize, push_back, indexing, sort, and the mistakes that cause TLE/WA.
  6. 06~15 min · 1 quiz questionstring Basics for InterviewsIndexing chars, ascii tricks, two pointers on strings, and anagram counting.
  7. 07~18 min · 1 quiz questionunordered_map & unordered_setHashing in C++ — the weapon behind Two Sum, duplicates, and anagrams.
  8. 08~16 min · 1 quiz questionTime & Space Complexity (Plain English)Big-O intuition so you can defend your solution in interviews.
  9. 09~14 min · 1 quiz questionSTL Algorithms You Actually Needsort, reverse, max/min, lower_bound — interview toolkit.
  10. 10~12 min · 1 quiz questionDebug Like a TeacherWhat to do when tests fail — before asking for a full solution.