For 2nd and 3rd question I cant Add diagram so please refer following explanation- 2nd question- They have given 12x12 pixel board and there are random black pixels are there, u have to find largest square formed by those black pixel in that entire 12x12 board(Hint- use matrix for black pixel=1 , white pixel=0) 3rd question- there is one big rectangle A yellow color, on top of that there are 3 more small black rectangle B,C,D covering some part of rectangle A. You have to find area of visible yellow part of rectangle A (Use some Data structure)
