Remove hardcoded difficulties and add dynamic difficulty management system

update_difficulties.sh

@@ -0,0 +1,191 @@
+#!/bin/bash
+
+# LeetCode Difficulty Updater
+# This script helps manage problem difficulties dynamically
+
+NOTES_DIR="src/notes"
+DIFFICULTY_FILE=".difficulty_mapping"
+
+# Function to show usage
+show_usage() {
+    echo "Usage: $0 [OPTIONS]"
+    echo ""
+    echo "Options:"
+    echo "  -a, --add <problem_number> <difficulty>    Add/update difficulty for a problem"
+    echo "  -r, --remove <problem_number>              Remove difficulty mapping for a problem"
+    echo "  -l, --list                                 List all difficulty mappings"
+    echo "  -u, --update-notes                         Update all note files with correct difficulties"
+    echo "  -h, --help                                 Show this help message"
+    echo ""
+    echo "Difficulties: Easy, Medium, Hard"
+    echo ""
+    echo "Examples:"
+    echo "  $0 -a 1 Easy"
+    echo "  $0 -a 4 Hard"
+    echo "  $0 -r 1"
+    echo "  $0 -l"
+    echo "  $0 -u"
+}
+
+# Function to get difficulty color for shields
+get_difficulty_color() {
+    local difficulty=$1
+    case $difficulty in
+        "Easy")
+            echo "brightgreen"
+            ;;
+        "Medium")
+            echo "orange"
+            ;;
+        "Hard")
+            echo "red"
+            ;;
+        *)
+            echo "blue"
+            ;;
+    esac
+}
+
+# Function to add/update difficulty mapping
+add_difficulty() {
+    local problem_num=$1
+    local difficulty=$2
+    
+    # Validate difficulty
+    case $difficulty in
+        "Easy"|"Medium"|"Hard")
+            ;;
+        *)
+            echo "❌ Error: Invalid difficulty '$difficulty'. Use Easy, Medium, or Hard."
+            exit 1
+            ;;
+    esac
+    
+    # Create difficulty file if it doesn't exist
+    touch "$DIFFICULTY_FILE"
+    
+    # Remove existing entry if it exists
+    sed -i.bak "/^$problem_num:/d" "$DIFFICULTY_FILE"
+    
+    # Add new entry
+    echo "$problem_num:$difficulty" >> "$DIFFICULTY_FILE"
+    
+    echo "✅ Added difficulty mapping: Problem $problem_num -> $difficulty"
+}
+
+# Function to remove difficulty mapping
+remove_difficulty() {
+    local problem_num=$1
+    
+    if [ -f "$DIFFICULTY_FILE" ]; then
+        sed -i.bak "/^$problem_num:/d" "$DIFFICULTY_FILE"
+        echo "✅ Removed difficulty mapping for problem $problem_num"
+    else
+        echo "⚠️  No difficulty mapping file found"
+    fi
+}
+
+# Function to list all difficulty mappings
+list_difficulties() {
+    if [ -f "$DIFFICULTY_FILE" ] && [ -s "$DIFFICULTY_FILE" ]; then
+        echo "📋 Current Difficulty Mappings:"
+        echo "Problem | Difficulty"
+        echo "--------|-----------"
+        sort -n "$DIFFICULTY_FILE" | while IFS=':' read -r problem difficulty; do
+            printf "%-7s | %s\n" "$problem" "$difficulty"
+        done
+    else
+        echo "📋 No difficulty mappings found"
+    fi
+}
+
+# Function to get difficulty from mapping file
+get_difficulty_from_file() {
+    local problem_num=$1
+    
+    if [ -f "$DIFFICULTY_FILE" ]; then
+        local difficulty=$(grep "^$problem_num:" "$DIFFICULTY_FILE" | cut -d':' -f2)
+        if [ -n "$difficulty" ]; then
+            echo "$difficulty"
+            return 0
+        fi
+    fi
+    
+    # Default to Medium if no mapping found
+    echo "Medium"
+    return 1
+}
+
+# Function to update note files with correct difficulties
+update_notes() {
+    echo "🔄 Updating note files with correct difficulties..."
+    
+    local updated_count=0
+    
+    if [ -d "$NOTES_DIR" ]; then
+        for note_file in "$NOTES_DIR"/*.md; do
+            if [ -f "$note_file" ]; then
+                # Extract problem number from filename
+                local filename=$(basename "$note_file")
+                local problem_num=$(echo "$filename" | sed 's/^\([0-9]*\)_.*/\1/')
+                
+                if [ -n "$problem_num" ] && [ "$problem_num" != "$filename" ]; then
+                    # Get correct difficulty
+                    local correct_difficulty=$(get_difficulty_from_file "$problem_num")
+                    local difficulty_color=$(get_difficulty_color "$correct_difficulty")
+                    
+                    # Update difficulty in note file
+                    sed -i.bak "s/\[!\[Difficulty\].*\]/\[!\[Difficulty\](https:\/\/img.shields.io\/badge\/Difficulty-$correct_difficulty-$difficulty_color?style=for-the-badge)\]/" "$note_file"
+                    sed -i.bak "s/\*\*Difficulty:\*\* \[.*\]/\*\*Difficulty:\*\* \[$correct_difficulty\](https:\/\/leetcode.com\/problemset\/?difficulty=$(echo "$correct_difficulty" | tr '[:lower:]' '[:upper:]'))/" "$note_file"
+                    
+                    echo "✅ Updated: $filename -> $correct_difficulty"
+                    ((updated_count++))
+                fi
+            fi
+        done
+        
+        # Clean up backup files
+        rm -f "$NOTES_DIR"/*.bak
+        rm -f "$DIFFICULTY_FILE.bak"
+        
+        echo "🎉 Updated $updated_count note files"
+    else
+        echo "❌ Notes directory not found"
+    fi
+}
+
+# Main script logic
+case "${1:-}" in
+    -a|--add)
+        if [ $# -eq 3 ]; then
+            add_difficulty "$2" "$3"
+        else
+            echo "❌ Error: Missing arguments for --add"
+            show_usage
+            exit 1
+        fi
+        ;;
+    -r|--remove)
+        if [ $# -eq 2 ]; then
+            remove_difficulty "$2"
+        else
+            echo "❌ Error: Missing problem number for --remove"
+            show_usage
+            exit 1
+        fi
+        ;;
+    -l|--list)
+        list_difficulties
+        ;;
+    -u|--update-notes)
+        update_notes
+        ;;
+    -h|--help|"")
+        show_usage
+        ;;
+    *)
+        echo "❌ Error: Unknown option '$1'"
+        show_usage
+        exit 1
+        ;;
+esac