Buggy python submission (verdict: Time Limit Exceeded):
import itertools
import numpy as np
N, K, *XY = [int(_) for _ in open(0).read().split()]
X = sorted(XY[::2])
Y = sorted(XY[1::2])
XY = np.array(XY, dtype=np.int64).reshape((N, 2)).T
ans = float('inf')
for x, y in itertools.product(itertools.combinations(X, 2), itertools.combinations(Y, 2)):
    F = (x[0] <= XY[0]) * (XY[0] <= x[1]) * (y[0] <= XY[1]) * (XY[1] <= y[1])
    if sum(F) < K:
        continue
    ans = min(ans, (x[1] - x[0]) * (y[1] - y[0]))
print(ans)


Fixed submission:
import itertools
N, K = [int(_) for _ in input().split()]
XY = [[int(_) for _ in input().split()] for _ in range(N)]
X, Y = [x for x, y in XY], [y for x, y in XY]
X_s, Y_s = sorted(X), sorted(Y)
ans = float('inf')
for x1, x2 in itertools.combinations(X_s, 2):
    for y1, y2 in itertools.combinations(Y_s, 2):
        k = sum([x1 <= X[i] <= x2 and y1 <= Y[i] <= y2 for i in range(N)])
        if k >= K:
            ans = min(ans, (x2 - x1) * (y2 - y1))
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
import itertools
N, K = [int(_) for _ in input().split()]
XY = [[int(_) for _ in input().split()] for _ in range(N)]
X, Y = sorted([x for x, y in XY]), sorted([y for x, y in XY])
ans = float('inf')
for x1, x2 in itertools.combinations(X, 2):
    for y1, y2 in itertools.combinations(Y, 2):
        k = sum([x1 <= XY[i][0] <= x2 and y1 <= XY[i][1] <= y2 for i in range(N)])
        if k >= K:
            ans = min(ans, (x2 - x1) * (y2 - y1))
print(ans)

Fixed submission:
import itertools
N, K = [int(_) for _ in input().split()]
XY = [[int(_) for _ in input().split()] for _ in range(N)]
X, Y = [x for x, y in XY], [y for x, y in XY]
X_s, Y_s = sorted(X), sorted(Y)
ans = float('inf')
for x1, x2 in itertools.combinations(X_s, 2):
    for y1, y2 in itertools.combinations(Y_s, 2):
        k = sum([x1 <= X[i] <= x2 and y1 <= Y[i] <= y2 for i in range(N)])
        if k >= K:
            ans = min(ans, (x2 - x1) * (y2 - y1))
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
import itertools
N, K = [int(_) for _ in input().split()]
X = [0] * N
Y = [0] * N
for i in range(N):
    X[i], Y[i] = [int(_) for _ in input().split()]
ans = float('inf')
for x1, x2 in itertools.combinations(X, 2):
    if x1 > x2:
        x1, x2 = x2, x1
    for y1, y2 in itertools.combinations(Y, 2):
        if y1 > y2:
            y1, y2 = y2, y1
        k = sum([x1 <= X[i] <= x2 and y1 <= Y[i] <= y2 for i in range(N)])
        if k >= K:
            ans = min(ans, (x2 - x1) * (y2 - y1))
print(ans)

Fixed submission:
import itertools
N, K = [int(_) for _ in input().split()]
XY = [[int(_) for _ in input().split()] for _ in range(N)]
X, Y = [x for x, y in XY], [y for x, y in XY]
X_s, Y_s = sorted(X), sorted(Y)
ans = float('inf')
for x1, x2 in itertools.combinations(X_s, 2):
    for y1, y2 in itertools.combinations(Y_s, 2):
        k = sum([x1 <= X[i] <= x2 and y1 <= Y[i] <= y2 for i in range(N)])
        if k >= K:
            ans = min(ans, (x2 - x1) * (y2 - y1))
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
import itertools
N, K = [int(_) for _ in input().split()]
X = [0] * N
Y = [0] * N
for i in range(N):
    X[i], Y[i] = [int(_) for _ in input().split()]
ans = float('inf')
for x1, x2 in itertools.combinations(X, 2):
    if x1 > x2:
        x1, x2 = x2, x1
    for y1, y2 in itertools.combinations(Y, 2):
        if y1 > y2:
            y1, y2 = y2, y1
        k = sum([x1 <= X[i] <= x2 and y1 <= Y[i] <= y2 for i in range(N)])
        if k >= K:
            ans = min(ans, (x2 - x1) * (y2 - y1))
print(ans)

Fixed submission:
import itertools
N, K = [int(_) for _ in input().split()]
XY = [[int(_) for _ in input().split()] for _ in range(N)]
X, Y = [x for x, y in XY], [y for x, y in XY]
X_s, Y_s = sorted(X), sorted(Y)
ans = float('inf')
for x1, x2 in itertools.combinations(X_s, 2):
    for y1, y2 in itertools.combinations(Y_s, 2):
        k = sum([x1 <= X[i] <= x2 and y1 <= Y[i] <= y2 for i in range(N)])
        if k >= K:
            ans = min(ans, (x2 - x1) * (y2 - y1))
print(ans)