Buggy python submission (verdict: Time Limit Exceeded):
import itertools

n, k = map(int, input().split())
xy = [tuple(map(int, input().split())) for i in range(n)]
ans = float("INF")
for a, b in itertools.combinations(xy, 2):
    for c, d in itertools.combinations(xy, 2):
        x1, x2 = sorted([a[0], b[0]])
        y1, y2 = sorted([c[1], d[1]])
        count = 0
        for x, y in xy:
            if x1 <= x <= x2 and y1 <= y <= y2:
                count += 1
        if count >= k:
            ans = min(ans, (x2 - x1) * (y2 - y1))
print(ans)

Fixed submission:
import itertools

n, k = map(int, input().split())
xy = [tuple(map(int, input().split())) for i in range(n)]
ans = float("INF")
for a, b in itertools.combinations(xy, 2):
    for c, d in itertools.combinations(xy, 2):
        x1, x2 = a[0], b[0]
        y1, y2 = c[1], d[1]
        count = 0
        for x, y in xy:
            if min(x1, x2) <= x <= max(x1, x2) and min(y1, y2) <= y <= max(y1, y2):
                count += 1
        if count >= k:
            ans = min(ans, abs(x1 - x2) * abs(y1 - y2))
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
import itertools

n, k = map(int, input().split())
xy = [tuple(map(int, input().split())) for i in range(n)]
ans = float("INF")
for a, b in itertools.combinations(xy, 2):
    for c, d in itertools.combinations(xy, 2):
        x1, x2 = a[0], b[0]
        y1, y2 = c[1], d[1]
        count = 0
        for x, y in xy:
            if min(x1, x2) <= x <= max(x1, x2) and min(y1, y2) <= y <= max(y1, y2):
                count += 1
        if count >= k:
            ans = min(ans, abs(x1 - x2) * abs(y1 - y2))
print(ans)

Fixed submission:
import itertools

n, k = map(int, input().split())
xy = [tuple(map(int, input().split())) for i in range(n)]
ans = float("INF")
for a, b in itertools.combinations(xy, 2):
    for c, d in itertools.combinations(xy, 2):
        x1, x2 = a[0], b[0]
        y1, y2 = c[1], d[1]
        count = 0
        for x, y in xy:
            if min(x1, x2) <= x <= max(x1, x2) and min(y1, y2) <= y <= max(y1, y2):
                count += 1
        if count >= k:
            ans = min(ans, abs(x1 - x2) * abs(y1 - y2))
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
n, k = map(int, input().split())
xy = [tuple(map(int, input().split())) for i in range(n)]
ans = float("INF")
for x1, _ in xy:
    for x2, _ in xy:
        for _, y1 in xy:
            for _, y2 in xy:
                count = 0
                for x, y in xy:
                    if min(x1, x2) <= x <= max(x1, x2) and min(y1, y2) <= y <= max(y1, y2):
                        count += 1
                if count >= k:
                    ans = min(ans, abs(x1 - x2) * abs(y1 - y2))
print(ans)

Fixed submission:
import itertools

n, k = map(int, input().split())
xy = [tuple(map(int, input().split())) for i in range(n)]
ans = float("INF")
for a, b in itertools.combinations(xy, 2):
    for c, d in itertools.combinations(xy, 2):
        x1, x2 = a[0], b[0]
        y1, y2 = c[1], d[1]
        count = 0
        for x, y in xy:
            if min(x1, x2) <= x <= max(x1, x2) and min(y1, y2) <= y <= max(y1, y2):
                count += 1
        if count >= k:
            ans = min(ans, abs(x1 - x2) * abs(y1 - y2))
print(ans)