Competitive Programming · Module 1 of 10

What competitive programming is

Solve well-defined problems fast and correctly under time and memory limits.

📖 Key ideas

A problem gives input format, output format and constraints.
Online judges (Codeforces, CodeChef, AtCoder, LeetCode) run your code on hidden tests.
Verdicts: AC (accepted), WA (wrong answer), TLE (time limit exceeded), MLE, RE (runtime error).
C++, Java and Python are the common languages; C++ is fastest.
Regular contests build speed, accuracy and problem patterns.

💡 Real-life example: A contest is like a cooking competition: the judges taste hidden plates, and only correct dishes within the time count.

ACAccepted: all tests passed

WAWrong answer on some test

TLETime limit exceeded

Online judgeSite that runs code on hidden tests