aditya verma
dp => https://www.youtube.com/playlist?list=PL_z_8CaSLPWekqhdCPmFohncHwz8TY2Go
backtracking => https://www.youtube.com/playlist?list=PL_z_8CaSLPWdbOTog8Jxk9XOjzUs3egMP
recursion => https://www.youtube.com/playlist?list=PL_z_8CaSLPWeT1ffjiImo0sYTcnLzo-wY

strivers graph playlist is also good one. =>https://www.youtube.com/playlist?list=PLgUwDviBIf0oE3gA41TKO2H5bHpPd7fzn