Technical Keeda

 Movie Festival CSES problem set solution - Problem statement-  Time limit:  1.00 s   Memory limit:  512 MB In a movie festival  n n  movies will be shown. You know the starting and ending time of each movie. What is the maximum number of movies you can watch entirely? Input The first input line has an integer  n n : the number of movies. After this, there are  n n  lines that describe the movies. Each line has two integers  a a  and  b b : the starting and ending times of a movie. Output Print one integer: the maximum number of movies. Constraints 1 ≤ n ≤ 2 ⋅ 10 5 1 ≤ n ≤ 2 ⋅ 10 5 1 ≤ a < b ≤ 10 9 1 ≤ a < b ≤ 10 9 Example Input: 3 3 5 4 9 5 8 Output: 2 Solution - Step -1 take input in a vector as a pair first element is ending time ans second element is starting time Step -2 sort the vector in increasing order because we will watch that movie which is ending first. Step -3 iterate over vector and calculate ans .           follow code below-

 Playlist CSES Problems set solution- Playlist problem statement- Time limit:  1.00 s   Memory limit:  512 MB You are given a playlist of a radio station since its establishment. The playlist has a total of  n n  songs. What is the longest sequence of successive songs where each song is unique? Input The first input line contains an integer  n n : the number of songs. The next line has  n n  integers  k 1 , k 2 , … , k n k 1 , k 2 , … , k n : the id number of each song. Output Print the length of the longest sequence of unique songs. Constraints 1 ≤ n ≤ 2 ⋅ 10 5 1 ≤ n ≤ 2 ⋅ 10 5 1 ≤ k i ≤ 10 9 1 ≤ k i ≤ 10 9 Example Input: 8 1 2 1 3 2 7 4 2 Output:5 Playlist CSE S Problems set solution- Step -1 store value in hashmap so that we can check that song played before or not. step -2 make two-pointer i and j if v[i] has occurred earlier remove all element till v[i] and update ans.new length will be (i-j). Step 3- if v[i]  not occurred simply update ans by one.

 Restaurant Customers cses problem solution - Problem Statement- Time limit:  1.00 s   Memory limit:  512 MB You are given the arrival and leaving times of  n n  customers in a restaurant. What was the maximum number of customers? Input The first input line has an integer  n n : the number of customers. After this, there are  n n  lines that describe the customers. Each line has two integers  a a  and  b b : the arrival and leaving times of a customer. You may assume that all arrival and leaving times are distinct. Output Print one integer: the maximum number of customers. Constraints 1 ≤ n ≤ 2 ⋅ 10 5 1 ≤ n ≤ 2 ⋅ 10 5 1 ≤ a < b ≤ 10 9 1 ≤ a < b ≤ 10 9 Example Input: 3 5 8 2 4 3 9 Output: 2 solution- Step 1- take input in a  vector which contain pair of int and bool and insert arrival time as true and leaving time as false. Step 2- sort the vector. stem 3- iterate over vector and when you found true update max if max > ans  step 4- else if you strike false update ans as ans-1 H