[Using DP to solve rob and coin change]

[takchiks]

No description provided.

[super30admin]

Strengths:

• You used dynamic programming with a 1D array, which is an efficient approach for the coin change problem.
• You correctly handled the initialization of the dp array with Integer.MAX_VALUE - 1 to avoid integer overflow.
• Your time and space complexity analysis for coinChange is correct.

Areas for improvement:

• The inner loop in coinChange can be optimized by starting from j = coins[i] instead of from 0. This would avoid the condition check if (j - coins[i] >= 0) for every j, making the code more efficient and cleaner.
• You included a solution for the "rob" problem in the same file, which is not related to the coin change problem. This might be a mistake. In the future, ensure that your submission only contains the solution for the problem at hand.
• Add comments to explain your approach for the coinChange method. This helps in understanding your code.
• Consider using more descriptive variable names. For example, instead of i and j, use coin and amt or similar.

Overall, your solution for coinChange is correct and efficient. However, the unrelated code should be removed.