📌 Problem Faced

While solving a Codeforces problem (Anton and Danik), I got Memory Limit Exceeded (MLE).

Code snippet:

int n, A=0, D=0;
char win[n];   // ❌ Problem here
scanf("%d", &n);

❗ What Went Wrong

I declared:

char win[n];

before assigning a value to n.

At that moment:

• n contains garbage value

• C does NOT auto-initialize variables

• So win[n] becomes something like:

  char win[928374912];  // random number
  

If that random number is large:

• Program tries to allocate huge stack memory
• Causes Memory Limit Exceeded

🧠 Core Concept Learned

🔹 In C, variables are NOT initialized automatically.

When you write: