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yenru0
2025-05-07 04:44:30 +09:00
parent 603fca2b20
commit 16a8e59450
426 changed files with 643 additions and 36 deletions
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zeta/py/completed/2166.py Normal file
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N = int(input())
points = [list(map(int, input().split())) for i in range(N)]
points += [points[0]]
N +=1
print("%.1f" % (abs(sum(points[i][0] * points[j][1] for i, j in zip(range(N - 1), range(1, N))) - sum(points[j][0] * points[i][1] for i, j in zip(range(N - 1), range(1, N))))/2))