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nhap ma tran,tim cot co so duong nhieu nhat

liet ke cac ptu thuoc (min,max)

nhat cac so duong va xep thanh day tang

nhap ma tran a,kiem tra tinh doi xung

nhap day,loai bo cac ptu trung nhau

tim cac so = tong 2 so trong day

sap xep day giam,kiem tra ptu x co ko,them x vao

tinh da thuc theo cong thuc honer

liet ke cac ptu chi xuat hien 1 lan

tim 2 ptu gan nhau nhat ve gia tri