[BOJ] 2166 다각형의 면적 (G5)

Author: jihostudy

김지호/5주차/260126.py

@@ -0,0 +1,18 @@
+# https://www.acmicpc.net/problem/2166
+
+import sys
+
+sys.stdin = open("./input.txt",'r')
+
+N = int(input())
+coordinates = []
+
+for _ in range(N):
+  coordinates.append(list(map(int,input().split(' '))))
+coordinates.append(coordinates[0])
+
+answer = 0
+for i in range(N):
+  answer += (coordinates[i][0] * coordinates[i+1][1]) - (coordinates[i+1][0]*coordinates[i][1])
+
+print(abs(answer)/2)