🔙 Backtracking Explained Like You're 5

Trying paths and undoing wrong choices

Day 94 of 149

👉 Full deep-dive with code examples

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The Maze Analogy

Solving a maze:

1. Walk until you hit a dead end
2. Backtrack to the last junction
3. Try a different path
4. Repeat until you find the exit!

Backtracking explores all possibilities by trying and undoing.

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How Backtracking Works

Start → Try path A → Dead end!
                    ↓
        Undo (backtrack) to start
                    ↓
        Try path B → Keep going!
                    ↓
        Dead end? Backtrack again

Systematically explores ALL options.

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Classic Example: N-Queens

Place N queens on an NxN board so none attack each other:

Try placing queen in row 1, column 1
    → Try row 2, column 1... conflict!
    → Backtrack, try column 2... conflict!
    → Backtrack, try column 3... works!
    → Continue to row 3...

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The Code Pattern

def backtrack(choices):
    if solved():
        return True

    for choice in choices:
        make_choice(choice)  # Try

        if backtrack(remaining):  # Explore
            return True

        undo_choice(choice)  # Backtrack!

    return False

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Famous Backtracking Problems

Problem	What You're Exploring
Sudoku	Number placements
N-Queens	Queen positions
Maze solving	Path choices
Permutations	All arrangements

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In One Sentence

Backtracking solves problems by exploring paths, undoing when stuck, and trying alternatives.

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