نقشه گز

main.py

import math

def solve():
    x_1, y_1, x_2, y_2 = map(int, input().split())

    ans = 0.0
    if x_1 == x_2:
        ans = abs(y_1 - y_2)
    elif y_1 == y_2:
        ans = abs(x_1 - x_2)
    else:
        r_1 = abs(x_1) + abs(y_1);
        r_2 = abs(x_2) + abs(y_2);
        ans = 0.5 * math.pi * min(r_1, r_2) + abs(r_1 - r_2);

    print(f'{ans:.6f}')

t = int(input())
for i in range(t):
	solve()