Polygon area

n = int(input())
x_list = []
y_list = []

for i in range(n):
    x, y = map(int, input().split())
    x_list.append(x)
    y_list.append(y)


def polygonArea(X, Y, n):
    area = 0.0
    j = n - 1
    for i in range(0, n):
        area += (X[j] + X[i]) * (Y[j] - Y[i])
        j = i
    return int(abs(area / 2.0))



print(2*polygonArea(x_list, y_list, n))

Test 1

Verdict: ACCEPTED

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: ACCEPTED