Polygon area

n = int(input())


last_x,last_y = [int(x) for x in input().split()]
area = 0 
first_x,first_y = last_x,last_y
for _ in range (n-1):
    curr_x,curr_y = [int(x) for x in input().split()]
    area += last_x*curr_y - last_y*curr_x
    last_x,last_y = curr_x,curr_y
area += last_x*first_y - last_y*first_x
print(abs(area))

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED