Question Link : https://leetcode.com/problems/robot-bounded-in-circle/

Difficulty: Medium

Premium: False

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On an infinite plane, a robot initially stands at (0, 0) and faces north. Note that:

The north direction is the positive direction of the y-axis. The south direction is the negative direction of the y-axis. The east …

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Question Link : https://leetcode.com/problems/zigzag-conversion/

Difficulty: Medium

Premium: False

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The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility)

P A H N A P L …

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Question Link : https://leetcode.com/problems/product-of-array-except-self/

Difficulty: Medium

Premium: False

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Given an integer array nums, return an array answer such that answer[i] is equal to the product of all the elements of nums except nums[i]. The product of any prefix or suffix of nums is guaranteed …

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Question Link : https://leetcode.com/problems/rotate-image/

Difficulty: Medium

Premium: False

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You are given an n x n 2D matrix representing an image, rotate the image by 90 degrees (clockwise). You have to rotate the image in-place, which means you have to modify the input 2D matrix directly. DO …

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Question Link : https://leetcode.com/problems/missing-number/

Difficulty: Easy

Premium: False

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Given an array nums containing n distinct numbers in the range [0, n], return the only number in the range that is missing from the array.   Example 1:

Input: nums = [3,0,1] Output: 2 Explanation: n = 3 …

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Question Link : https://leetcode.com/problems/task-scheduler/

Difficulty: Medium

Premium: False

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You are given an array of CPU tasks, each labeled with a letter from A to Z, and a number n. Each CPU interval can be idle or allow the completion of one task. Tasks can be completed …

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Question Link : https://leetcode.com/problems/number-of-same-end-substrings/

Difficulty: Medium

Premium: True

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You are given a 0-indexed string s, and a 2D array of integers queries, where queries[i] = [li, ri] indicates a substring of s starting from the index li and ending at the index ri (both inclusive), i …

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Question Link : https://leetcode.com/problems/palindrome-number/

Difficulty: Easy

Premium: False

Question

Given an integer x, return true if x is a palindrome, and false otherwise.   Example 1:

Input: x = 121 Output: true Explanation: 121 reads as 121 from left to right and from right to left.

Example 2:

Input …

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Question Link : https://leetcode.com/problems/number-of-zero-filled-subarrays/

Difficulty: Medium

Premium: False

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Given an integer array nums, return the number of subarrays filled with 0. A subarray is a contiguous non-empty sequence of elements within an array.   Example 1:

Input: nums = [1,3,0,0,2,0,0,4] Output …

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Question Link : https://leetcode.com/problems/ugly-number/

Difficulty: Easy

Question

An ugly number is a positive integer whose prime factors are limited to 2, 3, and 5. Given an integer n, return true if n is an ugly number.   Example 1:

Input: n = 6 Output: true Explanation: 6 = 2 × …

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