trua nay ngoi buon qua nen gui len day mot bai tap nho nho moi nguoi thuc hanh choi hen.
nhap vao mot so nguyen duong n co 3 chu so. tim vi tri xuat hien so lon nhat va xuat ra.
vd:195 .so lon nhat nam o hang chu la so 9
may cua khach khong co phan mem danh Tieng Viet nen khong danh duoc dau ngen moi nguoi