solution_library.py

#!/usr/bin/env python3
"""
Solution Library for LeetCode Problems
Contains actual implementations of solutions for common LeetCode problems.
"""

from typing import Dict, Optional, List


class SolutionLibrary:
    """Library of actual solution implementations for LeetCode problems."""
    
    def __init__(self):
        self.solutions = self._initialize_solutions()
    
    def _initialize_solutions(self) -> Dict:
        """Initialize the solution library with actual implementations."""
        return {
            # Problem 1: Two Sum
            'two-sum': {
                'python': '''def twoSum(self, nums: List[int], target: int) -> List[int]:
        """
        Use hash map to store seen numbers and their indices.
        Time: O(n), Space: O(n)
        """
        seen = {}
        for i, num in enumerate(nums):
            complement = target - num
            if complement in seen:
                return [seen[complement], i]
            seen[num] = i
        return []''',
                
                'java': '''public int[] twoSum(int[] nums, int target) {
        Map<Integer, Integer> map = new HashMap<>();
        for (int i = 0; i < nums.length; i++) {
            int complement = target - nums[i];
            if (map.containsKey(complement)) {
                return new int[]{map.get(complement), i};
            }
            map.put(nums[i], i);
        }
        return new int[]{};
    }''',
                
                'cpp': '''vector<int> twoSum(vector<int>& nums, int target) {
        unordered_map<int, int> map;
        for (int i = 0; i < nums.size(); i++) {
            int complement = target - nums[i];
            if (map.find(complement) != map.end()) {
                return {map[complement], i};
            }
            map[nums[i]] = i;
        }
        return {};
    }''',
                
                'c': '''int* twoSum(int* nums, int numsSize, int target, int* returnSize) {
        *returnSize = 2;
        int* result = (int*)malloc(2 * sizeof(int));
        for (int i = 0; i < numsSize; i++) {
            for (int j = i + 1; j < numsSize; j++) {
                if (nums[i] + nums[j] == target) {
                    result[0] = i;
                    result[1] = j;
                    return result;
                }
            }
        }
        *returnSize = 0;
        return NULL;
    }''',
                
                'csharp': '''public int[] TwoSum(int[] nums, int target) {
        Dictionary<int, int> map = new Dictionary<int, int>();
        for (int i = 0; i < nums.Length; i++) {
            int complement = target - nums[i];
            if (map.ContainsKey(complement)) {
                return new int[] { map[complement], i };
            }
            map[nums[i]] = i;
        }
        return new int[] {};
    }''',
                
                'javascript': '''var twoSum = function(nums, target) {
        const map = new Map();
        for (let i = 0; i < nums.length; i++) {
            const complement = target - nums[i];
            if (map.has(complement)) {
                return [map.get(complement), i];
            }
            map.set(nums[i], i);
        }
        return [];
    };''',
                
                'go': '''func twoSum(nums []int, target int) []int {
        m := make(map[int]int)
        for i, num := range nums {
            complement := target - num
            if idx, ok := m[complement]; ok {
                return []int{idx, i}
            }
            m[num] = i
        }
        return []int{}
    }''',
            },
            
            # Problem 2: Add Two Numbers
            'add-two-numbers': {
                'python': '''def addTwoNumbers(self, l1: Optional[ListNode], l2: Optional[ListNode]) -> Optional[ListNode]:
        """
        Add two numbers represented as linked lists.
        Time: O(max(m, n)), Space: O(max(m, n))
        """
        dummy = ListNode(0)
        current = dummy
        carry = 0
        
        while l1 or l2 or carry:
            val1 = l1.val if l1 else 0
            val2 = l2.val if l2 else 0
            total = val1 + val2 + carry
            carry = total // 10
            current.next = ListNode(total % 10)
            current = current.next
            l1 = l1.next if l1 else None
            l2 = l2.next if l2 else None
        
        return dummy.next''',
                
                'java': '''public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
        ListNode dummy = new ListNode(0);
        ListNode current = dummy;
        int carry = 0;
        
        while (l1 != null || l2 != null || carry != 0) {
            int val1 = l1 != null ? l1.val : 0;
            int val2 = l2 != null ? l2.val : 0;
            int sum = val1 + val2 + carry;
            carry = sum / 10;
            current.next = new ListNode(sum % 10);
            current = current.next;
            l1 = l1 != null ? l1.next : null;
            l2 = l2 != null ? l2.next : null;
        }
        
        return dummy.next;
    }''',
                
                'cpp': '''ListNode* addTwoNumbers(ListNode* l1, ListNode* l2) {
        ListNode* dummy = new ListNode(0);
        ListNode* current = dummy;
        int carry = 0;
        
        while (l1 || l2 || carry) {
            int val1 = l1 ? l1->val : 0;
            int val2 = l2 ? l2->val : 0;
            int sum = val1 + val2 + carry;
            carry = sum / 10;
            current->next = new ListNode(sum % 10);
            current = current->next;
            l1 = l1 ? l1->next : nullptr;
            l2 = l2 ? l2->next : nullptr;
        }
        
        return dummy->next;
    }''',
            },
            
            # Problem 11: Container With Most Water
            'container-with-most-water': {
                'python': '''def maxArea(self, height: List[int]) -> int:
        """
        Two pointers approach: start from both ends, move pointer with smaller height.
        Time: O(n), Space: O(1)
        """
        left, right = 0, len(height) - 1
        max_area = 0
        
        while left < right:
            width = right - left
            area = width * min(height[left], height[right])
            max_area = max(max_area, area)
            
            if height[left] < height[right]:
                left += 1
            else:
                right -= 1
        
        return max_area''',
                
                'java': '''public int maxArea(int[] height) {
        int left = 0, right = height.length - 1;
        int maxArea = 0;
        
        while (left < right) {
            int width = right - left;
            int area = width * Math.min(height[left], height[right]);
            maxArea = Math.max(maxArea, area);
            
            if (height[left] < height[right]) {
                left++;
            } else {
                right--;
            }
        }
        
        return maxArea;
    }''',
                
                'cpp': '''int maxArea(vector<int>& height) {
        int left = 0, right = height.size() - 1;
        int maxArea = 0;
        
        while (left < right) {
            int width = right - left;
            int area = width * min(height[left], height[right]);
            maxArea = max(maxArea, area);
            
            if (height[left] < height[right]) {
                left++;
            } else {
                right--;
            }
        }
        
        return maxArea;
    }''',
                
                'csharp': '''public int MaxArea(int[] height) {
        int left = 0, right = height.Length - 1;
        int maxArea = 0;
        
        while (left < right) {
            int width = right - left;
            int area = width * Math.Min(height[left], height[right]);
            maxArea = Math.Max(maxArea, area);
            
            if (height[left] < height[right]) {
                left++;
            } else {
                right--;
            }
        }
        
        return maxArea;
    }''',
            },
        }
    
    def get_solution(self, title_slug: str, language: str) -> Optional[str]:
        """Get solution for a problem by title slug and language."""
        lang_lower = language.lower()
        # Normalize language names
        lang_map = {
            'python': 'python',
            'python3': 'python',
            'java': 'java',
            'cpp': 'cpp',
            'c++': 'cpp',
            'c': 'c',
            'csharp': 'csharp',
            'c#': 'csharp',
            'javascript': 'javascript',
            'typescript': 'javascript',  # Similar syntax
            'go': 'go',
        }
        
        normalized_lang = lang_map.get(lang_lower, lang_lower)
        
        if title_slug in self.solutions:
            return self.solutions[title_slug].get(normalized_lang)
        
        return None
    
    def has_solution(self, title_slug: str) -> bool:
        """Check if solution exists for a problem."""
        return title_slug in self.solutions