Don't think about level order traversal
Don\'t be fooled by the example testcases.\n\nlook at this--> [2,1,3,null,4]  ans =7;\n```\t\t\n\t\t2\n\t1      3\n4\t\n\nans = 4+3\n\n//LOL
Don\'t be fooled by the example testcases.\n\nlook at this--> [2,1,3,null,4]  ans =7;\n```\t\t\n\t\t2\n\t1      3\n4\t\n\nans = 4+3\n\n//LOL
[]