1653. Minimum Deletions to Make String Balanced
You are given a string s consisting only of characters ‘a’ and ‘b’. You can delete any number of characters in s to make s balanced. s is balanced if there is no […]
Rat in a Maze Problem – I
Consider a rat placed at (0, 0) in a square matrix mat of order n* n. It has to reach the destination at (n – 1,
1395. Count Number of Teams
There are n soldiers standing in a line. Each soldier is assigned a unique rating value. You have to form a team of 3 soldiers
Row with max 1s
Given a boolean 2D array, consisting of only 1’s and 0’s, where each row is sorted. Find the 0-based index of
2045. Second Minimum Time to Reach Destination
A city is represented as a bi-directional connected graph with n vertices where each vertex is labeled from 1 to n (inclusive). The edges in the graph are
Remove Duplicates
Given a string str without spaces, the task is to remove all duplicate characters from it, keeping only the first occurrence. Note: The
2976. Minimum Cost to Convert String I
You are given two 0-indexed strings source and target, both of length n and consisting of lowercase English letters. You are also given two 0-indexed character arrays original and changed, and an integer array cost,
Form a palindrome
Given a string, find the minimum number of characters to be inserted to convert it to a palindrome. Examples :
1334. Find the City With the Smallest Number of Neighbors at a Threshold Distance
There are n cities numbered from 0 to n-1. Given the array edges where edges[i] = [fromi, toi, weighti] represents a bidirectional and weighted edge between cities fromi and toi, and given
K-Pangrams
Given a string str and an integer k, return true if the string can be changed into a pangram after at most k operations, else
912. Sort an Array
Given an array of integers nums, sort the array in ascending order and return it. You must solve the problem without using
Array to BST
Given a sorted array. Convert it into a Height Balanced Binary Search Tree (BST). Return the root of the BST. Height-balanced BST means a binary tree in