S-----------upp-----------ose----------- we----------- wa-----------nt -----------to -----------cre-----------ate----------- a -----------met-----------hod----------- fo-----------r t-----------he -----------cla-----------ss -----------Bin-----------ary-----------Tre-----------e t-----------hat----------- co-----------unt-----------s t-----------he -----------num-----------ber----------- of----------- ti-----------mes----------- an----------- ob-----------jec-----------t o-----------ccu-----------rs -----------in -----------the----------- tr-----------ee.----------- Th-----------e h-----------ead-----------er -----------of -----------the----------- me-----------tho-----------d c-----------oul-----------d b-----------e a-----------s f-----------oll-----------ows-----------: -----------pub-----------lic----------- in-----------t c-----------oun-----------t(T----------- an-----------Obj-----------ect-----------) -----------a. -----------Wri-----------te -----------thi-----------s m-----------eth-----------od -----------usi-----------ng -----------a p-----------riv-----------ate----------- re-----------cur-----------siv-----------e m-----------eth-----------od -----------of -----------the----------- sa-----------me -----------nam-----------e. ----------- b.----------- Wr-----------ite----------- th-----------e m-----------eth-----------od -----------usi-----------ng -----------one----------- of----------- th-----------e i-----------ter-----------ato-----------rs -----------of -----------the----------- bi-----------nar-----------y t-----------ree-----------. -----------c. -----------Com-----------par-----------e t-----------he -----------eff-----------ici-----------enc-----------ies----------- of----------- th-----------e p-----------rev-----------iou-----------s t-----------wo -----------ver-----------sio-----------ns -----------of -----------the----------- me-----------tho-----------d. ----------- An-----------swe-----------r: ----------- Th-----------e d-----------esi-----------red-----------