Today’s question is from Daily Leetcode Coding Challenge — March Edition. It is a medium-tagged question. Let us look into the problem statement.

**841****. Keys and Rooms**

There are `N`

rooms and you start in room `0`

. Each room has a distinct number in `0, 1, 2, ..., …`

Today’s question is a SQL question. Let us look into the problem statement.

**196****. Delete Duplicate Emails**

Write a SQL query to **delete** all duplicate email entries in a table named `Person`

, keeping only unique emails based on its *smallest* **Id**.

`+----+------------------+`

| Id | Email…

Today’s question is a Math based question. It is taken from the Daily leetcode coding challenge- March edition. Let us look into the problem statement.

**478****. Generate Random Point in a Circle**

Given the radius and x-y positions of the center of a circle, write a function `randPoint`

which generates…

Today’s question is from the Daily Leetcode coding challenge — March edition. Let us look into the problem statement.

**714****. Best Time to Buy and Sell Stock with Transaction Fee**

You are given an array `prices`

where `prices[i]`

is the price of a given stock on the `ith`

day, and…

Today’s question is taken from the Daily Leetcode Coding challenge — March edition. Let us look into the problem statement.

**1721****. Swapping Nodes in a Linked List**

You are given the `head`

of a linked list, and an integer `k`

.

Return *the head of the linked list after **swapping** the…*

Today’s question is from Leetcode’s Daily coding Challenge- March Edition. Let us look into the problem statement.

**1461****. Check If a String Contains All Binary Codes of Size K**

Given a binary string `s`

and an integer `k`

.

Return *True* if every binary code of length `k`

is a substring…

Today’s question is a Hard-tagged question on Leetcode. This question is quite frequently asked in technical interviews. Let us look into the problem statement.

**41****. First Missing Positive**

Given an unsorted integer array `nums`

, find the smallest missing positive integer.

**Example 1:**

**Input:** nums = [1,2,0]

**Output:** 3

**Example 2:**

**…**

Today’s question is a medium-tagged question in Leetcode. This question is asked in multiple coding interviews. Let us look into the problem statement.

**12****. Integer to Roman**

Roman numerals are represented by seven different symbols: `I`

, `V`

, `X`

, `L`

, `C`

, `D`

and `M`

.

**Symbol**…

Today’s question is a SQL question. Let us look into the problem statement.

**181****. Employees Earning More Than Their Managers**

The `Employee`

table holds all employees including their managers. Every employee has an Id, and there is also a column for the manager Id.

`+----+-------+--------+-----------+`

| Id | Name |…

Today’s question is a medium-tagged question on leetcode. Let us look into the problem statement.

**247****. Strobogrammatic Number II**

Given an integer `n`

, return all the **strobogrammatic numbers** that are of length `n`

. You may return the answer in **any order**.

A **strobogrammatic number** is a number that looks the…

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