Coding Interview Resources
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This channel contains the free resources and solution of coding problems which are usually asked in the interviews.

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๐Ÿ’ป HOW TO DEBUG YOUR CODE ๐Ÿ›๐Ÿ”

1๏ธโƒฃ READ THE ERROR MESSAGE

Don't ignore the error.

An error message usually tells you:

๐Ÿ‘‰ What went wrong

๐Ÿ‘‰ Where it happened

๐Ÿ‘‰ Sometimes why it happened

Example:

"NameError: name 'total' is not defined"

This tells you that Python cannot find a variable called "total".

2๏ธโƒฃ CHECK THE LINE NUMBER

Most programming errors tell you where the problem occurred.

Go directly to that line.

Then check:

โ€ข Variable names

โ€ข Syntax

โ€ข Data types

โ€ข Function calls

โ€ข Missing brackets

โ€ข Incorrect indentation

3๏ธโƒฃ UNDERSTAND THE ERROR TYPE

Common errors beginners encounter:

"SyntaxError" โ†’ Code doesn't follow the language syntax.

"NameError" โ†’ You used a name that hasn't been defined.

"TypeError" โ†’ An operation was performed on an incompatible data type.

"IndexError" โ†’ You tried to access an invalid index.

"KeyError" โ†’ A dictionary key doesn't exist.

"ValueError" โ†’ A value has the wrong format or isn't acceptable.

๐Ÿ‘‰ Learn what common errors mean instead of simply searching for fixes.

4๏ธโƒฃ CHECK YOUR ASSUMPTIONS

Sometimes your code runs without an error but produces the wrong result.

Example:

"age = "25""

You might think "age" contains a number.

But it actually contains a string.

Always ask:

๐Ÿ‘‰ What type is this variable?

๐Ÿ‘‰ What value does it currently contain?

5๏ธโƒฃ PRINT INTERMEDIATE VALUES

When you're unsure what is happening, inspect your variables.

Example:

"print(total)"

"print(count)"

"print(average)"

This helps you understand how the values change while your program runs.

6๏ธโƒฃ BREAK THE PROBLEM INTO SMALL PARTS

Don't debug 200 lines of code at once.

Separate the problem.

Instead of asking:

โŒ "Why doesn't my program work?"

Ask:

โœ… "Is my input correct?"

Then:

โœ… "Is my calculation correct?"

Then:

โœ… "Is my loop working?"

Then:

โœ… "Is my output correct?"

Small questions are easier to solve.

7๏ธโƒฃ CHECK YOUR LOOP

Loops are a common source of bugs.

Check:

๐Ÿ‘‰ Where does the loop start?

๐Ÿ‘‰ When does it stop?

๐Ÿ‘‰ Is the condition correct?

๐Ÿ‘‰ Is the variable being updated?

๐Ÿ‘‰ Could this become an infinite loop?

Example:

"while count < 10:"

" print(count)"

" count += 1"

If "count" never changes, the loop may never end.

8๏ธโƒฃ CHECK YOUR DATA TYPES

Many bugs happen because developers expect one type but receive another.

Example:

""10" + "20""

Result:

""1020""

But:

10 + 20

Result:

30

The values look similar, but their data types are different.

9๏ธโƒฃ TEST WITH SIMPLE INPUT

If your program fails with complicated data, simplify it.

Instead of:

[15, 82, 43, 91, 27, 64, 10]

Try:

[1, 2, 3]

Then:

[1]

Then:

[]

Simple inputs make problems easier to identify.

๐Ÿ”Ÿ TEST EDGE CASES

Always test unusual situations.

Examples:

โ€ข Empty input

โ€ข One element

โ€ข Duplicate values

โ€ข Negative numbers

โ€ข Very large numbers

โ€ข Missing values

โ€ข Invalid input

A solution isn't truly reliable until you understand how it behaves in these situations.

1๏ธโƒฃ1๏ธโƒฃ USE A DEBUGGER

As your programs become larger, use debugging tools.

A debugger allows you to:

๐Ÿ”น Pause execution

๐Ÿ”น Inspect variables

๐Ÿ”น Execute code step by step

๐Ÿ”น Set breakpoints

๐Ÿ”น Find where the logic goes wrong

This is much more powerful than adding "print()" everywhere.
1๏ธโƒฃ2๏ธโƒฃ DON'T CHANGE EVERYTHING AT ONCE

Suppose your code has a bug.

Don't change five different things and run it again.

Instead:

๐Ÿ‘‰ Change one thing

๐Ÿ‘‰ Run the program

๐Ÿ‘‰ Observe the result

๐Ÿ‘‰ Understand what changed

This makes it much easier to identify the actual cause.

1๏ธโƒฃ3๏ธโƒฃ REPRODUCE THE BUG

Before fixing a problem, make sure you can consistently reproduce it.

Ask:

"When exactly does this error happen?"

For example:

โŒ It fails sometimes.

Better:

โœ… It fails when the input list is empty.

Now you have a specific problem to investigate.

1๏ธโƒฃ4๏ธโƒฃ FIX THE ROOT CAUSE

Don't just hide the error.

Example:

If a variable becomes "None" unexpectedly, don't simply add code that ignores "None".

Find out:

๐Ÿ‘‰ Why did it become "None"?

Fixing the root cause prevents the same problem from appearing elsewhere.

1๏ธโƒฃ5๏ธโƒฃ RETEST AFTER FIXING

Your job isn't finished when the error disappears.

Run:

โœ… The original test

โœ… Normal cases

โœ… Edge cases

โœ… Related functionality

A fix can sometimes create a new bug.

๐Ÿ”ฅ THE DEBUGGING FORMULA

Read the error

โ†“

Find the location

โ†“

Understand the error

โ†“

Check variables & data types

โ†“

Reproduce the problem

โ†“

Test with simple input

โ†“

Debug step by step

โ†“

Fix the root cause

โ†“

Test again

๐Ÿ’ก REMEMBER:

Every programmer writes buggy code.

The difference between a beginner and an experienced programmer isn't that experienced programmers never make mistakes.

They know how to find, understand, and fix them.

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๐Ÿง  HOW TO IMPROVE YOUR CODING LOGIC AS A BEGINNER ๐Ÿ’ป๐Ÿ”ฅ

You know variables. You understand loops. You can write functions.

But when someone gives you a coding problemโ€ฆ you don't know where to start.

This is completely normal for beginners. Coding logic isn't something you memorize. It's something you build through practice.

Here's how ๐Ÿ‘‡

1๏ธโƒฃ SOLVE THE PROBLEM WITHOUT CODE FIRST

Before touching the keyboard, ask:

๐Ÿ‘‰ How would I solve this manually?

Example: Find the largest number in [4, 9, 2, 7]

Think:

โ€ข Start with "4"

โ€ข Compare with "9" โ†’ largest = "9"

โ€ข Compare with "2" โ†’ largest remains "9"

โ€ข Compare with "7" โ†’ largest remains "9"

Now convert those steps into code.

๐Ÿ’ก If you can't explain the solution in simple words, writing the code will be difficult.

2๏ธโƒฃ BREAK BIG PROBLEMS INTO SMALLER PROBLEMS

Don't think: โŒ "How do I build this entire program?"

Think:

โ€ข โœ… What input do I need?

โ€ข โœ… What data should I store?

โ€ข โœ… What calculation should happen?

โ€ข โœ… What conditions should I check?

โ€ข โœ… What should I return?

Solve one small piece at a time.

3๏ธโƒฃ PRACTICE PATTERN RECOGNITION

Many coding problems are variations of patterns you've already seen.

For example:

โ€ข "Find maximum value"

โ€ข "Find minimum value"

โ€ข "Calculate total"

โ€ข "Count occurrences"

All involve traversing data and maintaining some information. The more problems you solve, the faster you'll recognize these patterns.

4๏ธโƒฃ TRACE CODE ON PAPER

Take a small piece of code:

total = 0

for num in [2, 4, 6]: total += num

Trace it manually:

โ€ข Start โ†’ total = 0

โ€ข After "2" โ†’ total = 2

โ€ข After "4" โ†’ total = 6

โ€ข After "6" โ†’ total = 12

Tracing teaches you how programs actually execute.

5๏ธโƒฃ MASTER LOOPS & CONDITIONS

A huge number of beginner problems can be solved using:

โ€ข Variables

โ€ข Loops

โ€ข Conditions

Before jumping into advanced algorithms, become comfortable combining basic concepts.

6๏ธโƒฃ ASK THE RIGHT QUESTIONS

When solving a problem, ask:

โ€ข ๐Ÿ”น What information do I need to remember?

โ€ข ๐Ÿ”น Do I need to check every element?

โ€ข ๐Ÿ”น Do I need a counter?

โ€ข ๐Ÿ”น Do I need to compare values?

โ€ข ๐Ÿ”น Do I need to store previous results?

โ€ข ๐Ÿ”น Can a list, set, or dictionary make this easier?

7๏ธโƒฃ START WITH BRUTE FORCE

Don't obsess over finding the perfect solution immediately.

First ask: "What's the simplest solution that works?"

โ€ข Write it

โ€ข Test it

โ€ข Understand it

โ€ข Then ask: "Can I make this faster or simpler?"

Correct โ†’ Optimize. Not: Optimize โ†’ Hope it's correct.

8๏ธโƒฃ SOLVE VARIATIONS OF THE SAME PROBLEM

Suppose you solve: "Find the largest number." Now try:

โ€ข ๐Ÿ‘‰ Find the smallest number

โ€ข ๐Ÿ‘‰ Find the second largest

โ€ข ๐Ÿ‘‰ Find the largest even number

โ€ข ๐Ÿ‘‰ Find the largest without using max()

โ€ข ๐Ÿ‘‰ Find the largest and its position

One problem can teach you several concepts.

9๏ธโƒฃ DON'T LOOK AT THE SOLUTION TOO QUICKLY

Getting stuck is part of learning.

Give yourself some time:

โ€ข Try examples

โ€ข Draw the problem

โ€ข Write pseudocode

โ€ข Test ideas

If you're still stuck, look at a hint first โ€” not the complete solution.

๐Ÿ”Ÿ AFTER SEEING A SOLUTION, RECREATE IT

Reading a solution can make you think: "Oh, I understand it."

Close the solution. Now write it yourself.
โค1
If you can't recreate the logic, you probably haven't fully understood it yet.

1๏ธโƒฃ1๏ธโƒฃ EXPLAIN YOUR SOLUTION OUT LOUD

After solving a problem, explain:

โ€ข ๐Ÿ‘‰ What approach did I use?

โ€ข ๐Ÿ‘‰ Why does it work?

โ€ข ๐Ÿ‘‰ What is the time complexity?

โ€ข ๐Ÿ‘‰ Could I solve it another way?

If you can explain your solution clearly, your understanding is becoming stronger.

1๏ธโƒฃ2๏ธโƒฃ PRACTICE CONSISTENTLY

Don't solve 30 problems today and then nothing for three weeks.

โ€ข Beginner โ†’ 1โ€“2 problems daily

โ€ข Focus on understanding rather than quantity

๐Ÿ’ฏ Choose a problem โ†’ Understand input & output โ†’ Solve manually โ†’ Write the steps โ†’ Convert steps into pseudocode โ†’ Write code โ†’ Test it โ†’ Debug mistakes โ†’ Check another approach โ†’ Explain what you learned

๐Ÿ’กYou don't improve coding logic by watching more tutorials. You improve it by sitting with problems, getting stuck, trying different approaches, making mistakes โ€” and eventually figuring out why something works.

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