EasyCompleted

Two Sum Problem

Array manipulation with hash map optimization

A+

Overall Grade

Performance Overview

Time Taken

8 minutes

Complexity Accuracy

Perfect

Edge Cases Discussed

Yes

Alternative Solutions

Discussed

Your Solution

function twoSum(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 [];
}

Optimal O(n) time complexity

Clean, readable code structure

Proper edge case handling

AI Feedback

Strengths

• Immediately identified optimal hash map approach
• Excellent explanation of time/space complexity
• Discussed edge cases proactively
• Clean, production-ready code style

Additional Insights

Your solution demonstrates strong algorithmic thinking. You correctly identified that the brute force O(n²) approach could be optimized using a hash map for O(n) lookup time.

Detailed Performance Metrics

Problem Understanding95%

Code Quality98%

Communication92%

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