Instead of learning solutions of LeetCode questions, understand patterns! 🙂

𝑴𝒖𝒔𝒕 𝑺𝒂𝒗𝒆 𝒂𝒏𝒅 𝑺𝒉𝒂𝒓𝒆 !!!!

For ex.

If input array is sorted then
- Binary search
- Two pointers

If asked for all permutations/subsets then
- Backtracking

If given a tree then
- DFS
- BFS

If given a graph then
- DFS
- BFS

If given a linked list then
- Two pointers

If recursion is banned then
- Stack

If must solve in-place then
- Swap corresponding values
- Store one or more different values in the same pointer

If asked for maximum/minimum subarray/subset/options then
- Dynamic programming

If asked for top/least K items then
- Heap

If asked for common strings then
- Map
- Trie

Else
- Map/Set for O(1) time & O(n) space
- Sort input for O(nlogn) time and O(1) space



Link : https://t.me/teamJavaHyd👈👈👈


Check out a GitHub repo by Sean Prasad if you're interested to read more about this, it's absolutely amazing!


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public class PerfectNumber
{
public static void main(String[] args)
{
for (int number = 1; number <= 1000; number++)
{
int temp = 0;
for (int i = 1; i <= number / 2; i++)
{
if (number % i == 0)
{
temp += i;
}
}
if (temp == number)
{
System.out.println(number + " is a perfect number");
}
}
}
}

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