adieu lamiKoyomi help Oshino acquaintance care open space abandon Eikou Cram School building Oshinos makeshift residenceThe space represent rectangular grid nm cell arrange n row m column the cth cell rth row denote rcOshino place remove barrier rectangular area cell specifically action denote 1 r1 c1 r2 c2 mean Oshinos place barrier rectangle corner r1c1 r2c2 side parallel square side similarly 2 r1 c1 r2 c2 mean Oshinos remove barrier rectangle Oshino ensure barrier stay ground share common point intersect boundary nm areasometime Koyomi try walk cell carefully stride barrier order avoid damaging item grind 3 r1 c1 r2 c2 mean Koyomi try walk r1c1 r2c2 crossing barriersAnd you re tell Koyomi feasibility attempt