Max_element(v.begin(),v.end()) - v.end() • to get the max elements index in C++

Catalan number applications: 1.Number of possible binary search trees with n keys 2.number of expressions containing n pairs of parenthesis 3.number of ways a convex polygon of n+2 sides can split into triangles by connecting vertices 4. Number of full binary trees with n+1 lev

Set VS unordered_set in C++ STL • search time log(n) vs O(1){O(n) wrost case} • Insertion time log(n) vs same as search • deletion time log(n) vs same as search

C++ tip: Use memset to initialise a 2D vector

OOPS chit bit : Static member functions are allowed to access only the static data members or other static member functions

LC June day1 : Solution algo: 1.there can be 8 neighbours to a cell in 2D matrix 2.make recursive call to every neighbour 3.keep record of all the visited cells 4. in very DFS update the maximum length region

Day1 Leetcode June challenge Question: Max Area of island Concept used : BFS/DFS on grid represented graph

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