Competative Coding 3

[MeghaN28]

No description provided.

[super30admin]

Interview Problem : Pascal's Triangle (PascalTraingle.java)

Your solution is correct and efficient. You've correctly identified the time and space complexity. The code is well-structured and follows good practices with clear comments explaining the approach. One minor improvement: instead of using Arrays.asList(1) for the first row, which creates a fixed-size list, you are wrapping it in a new ArrayList which is good to avoid potential issues with fixed-size lists. However, note that Arrays.asList(1) returns a list containing a single integer 1, which is exactly what we need. Another small point: in the inner loop, you are iterating from j=0 to j<=i, which is correct for the row index i (which has i+1 elements). This is efficient and straightforward. Overall, excellent job!

VERDICT: PASS

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Interview Problem: Pairs with K difference (SumofK.java)

Your solution is well-written and efficient. You correctly identified the use of a frequency map to count unique pairs. The code is clean and well-commented. However, there is one minor improvement: you can avoid using the variable "value" in the loop when k != 0, since it is only used for k=0. You can restructure the loop to only use the frequency for k=0. For example:

if (k == 0) {
if (entry.getValue() > 1) count++;
} else {
if (map.containsKey(entry.getKey() + k)) count++;
}

This is exactly what you did. So it's fine.

Another point: your solution is actually more efficient than the reference solution in terms of space because you don't store the pairs but only count them. The reference solution uses a set of vectors which might be less efficient.

Overall, great job!

VERDICT: PASS