여름의 대삼각형 # -*- coding: utf-8 -*- # UTF-8 encoding when using korean x1, y1 = map(int, input().split(' ')) x2, y2 = map(int, input().split(' ')) x3, y3 = map(int, input().split(' ')) S = (x1*y2 + x2*y3 + x3*y1) - (x1*y3 + x3*y2 + x2*y1) if S < 0: S = -S print("%.2f" %(S/2)) 배열 합치기 # -*- coding: utf-8 -*- # UTF-8 encoding when using korean a_size, b_size = map(int, input().split(" ")) a = list(map..