completed DP - 1

[yashhh-23]

No description provided.

[super30admin]

The Coin Change (coinchange.java)

Strengths:

• Excellent use of dynamic programming, which is the optimal approach for this problem
• Clear comments explaining the approach and time/space complexity
• Correct handling of edge cases (amount = 0 would work due to Java's default initialization to 0)
• Good variable naming conventions

Areas for Improvement:

• The code can be optimized to use O(m) space instead of O(n*m) by using a 1D array, which would reduce memory usage
• The indentation of the else block could be improved for better readability
• Consider adding comments for the recurrence relation to make the logic clearer

VERDICT: PASS

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House Robber (houserobber.java)

Strengths:

• Excellent use of dynamic programming to achieve optimal O(n) time complexity
• Clean and readable code with meaningful variable names
• Proper edge case handling (n==1)
• Good explanatory comments that describe the approach clearly
• Correct recurrence relation implementation

Areas for Improvement:

• Space optimization: Since each dp[i] only depends on dp[i-1] and dp[i-2], you could reduce space complexity to O(1) by using two variables instead of an entire array
• Consider adding comments about the recurrence relation for educational value

Minor Suggestion:

// Could be optimized to O(1) space:
// int prev2 = nums[0];
// int prev1 = Math.max(nums[0], nums[1]);
// for(int i=2; i<n; i++){
//     int curr = Math.max(prev1, nums[i] + prev2);
//     prev2 = prev1;
//     prev1 = curr;
// }
// return prev1;

VERDICT: PASS