Polygon area

def polygon(n,points):
    segements = []
    prev = points[-1]
    for i in points:
        segements.append((prev,i))
        prev = i
    return abs(sum(x0*y1 - x1*y0 for ([x0, y0], [x1, y1]) in segements))




if __name__ == "__main__":
    points = []
    n = int(input())
    for i in range(n):
        points.append([int(input) for input in input().split(" ")])
    res = polygon(n, points)
    print(res)


"""
Input:
4
1 1
4 2
3 5
1 4

Output:
16
"""

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED