you give string start target length n each string consist character L R _ wherethe character L R represent piece piece L leave blank space directly leave piece r right blank space directly rightthe character _ represent blank space occupy L R piecesreturn true possible obtain string target move piece string start number time otherwise return false example 1input start _ l__r__r _ target l______rroutput trueexplanation we obtain string target start follow move move piece step leave start equal L___R__R _ move piece step right start equal L___R___R move second piece step right start equal l______rrsince possible string target start return trueExample 2input start r_l _ target _ _ lroutput falseexplanation the r piece string start step right obtain _ rl_after piece anymore impossible obtain string target startexample 3input start _ r target r_output falseexplanation the piece string start right impossible obtain string target start Constraintsn startlength targetlength1 n 105start target consist character L R _