Buggy python submission (verdict: Time Limit Exceeded):
N,K=map(int,input().split())
D=[]
X=[]
Y=[]

for i in range(N):
    x,y=map(int,input().split())
    D.append([x,y])
    X.append(x)
    Y.append(y)
    
X.sort()
Y.sort()
D.sort()
ans=10**20
for a in range(len(X)):
    for b in range(len(X)-a):
        if len(X)-b-a<K:
            break
        for c in range(len(Y)):
            for d in range(len(Y)-c):
                cnt=0
                for e in range(a,len(X)-b):
                    if X[a]<=D[e][0]<=X[len(X)-1-b] and Y[c]<=D[e][1]<=Y[len(Y)-1-d]:
                        cnt+=1
                if cnt>=K and ans>abs(X[a]-X[len(X)-1-b])*abs(Y[c]-Y[len(Y)-1-d]):
                    ans=abs(X[a]-X[len(X)-1-b])*abs(Y[c]-Y[len(Y)-1-d])
print(ans)

Fixed submission:
N,K=map(int,input().split())
D=[]
X=[]
Y=[]

for i in range(N):
    x,y=map(int,input().split())
    D.append([x,y])
    X.append(x)
    Y.append(y)
    
X.sort()
Y.sort()
D.sort()
ans=10**20
for a in range(len(X)):
    for b in range(len(X)-a):
        if len(X)-b-a<K:
            break
        for c in range(len(Y)):
            for d in range(len(Y)-c):
                cnt=0
                for e in range(a,len(X)-b):
                    if X[a]<=D[e][0]<=X[len(X)-1-b] and Y[c]<=D[e][1]<=Y[len(Y)-1-d]:
                        cnt+=1
                if cnt>=K and ans>abs(X[a]-X[len(X)-1-b])*abs(Y[c]-Y[len(Y)-1-d]):
                    ans=abs(X[a]-X[len(X)-1-b])*abs(Y[c]-Y[len(Y)-1-d])
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
N,K=map(int,input().split())
D=[]
X=[]
Y=[]

for i in range(N):
    x,y=map(int,input().split())
    D.append([x,y])
    X.append(x)
    Y.append(y)
    
X.sort()
Y.sort()
ans=10**20
for a in range(len(X)):
    for b in range(len(X)-a):
        if len(X)-b-a<K:
            break
        for c in range(len(Y)):
            for d in range(len(Y)-c):
                cnt=0
                for e in range(N):
                    if X[a]<=D[e][0]<=X[len(X)-1-b] and Y[c]<=D[e][1]<=Y[len(Y)-1-d]:
                        cnt+=1
                if cnt>=K and ans>abs(X[a]-X[len(X)-1-b])*abs(Y[c]-Y[len(Y)-1-d]):
                    ans=abs(X[a]-X[len(X)-1-b])*abs(Y[c]-Y[len(Y)-1-d])
print(ans)

Fixed submission:
N,K=map(int,input().split())
D=[]
X=[]
Y=[]

for i in range(N):
    x,y=map(int,input().split())
    D.append([x,y])
    X.append(x)
    Y.append(y)
    
X.sort()
Y.sort()
D.sort()
ans=10**20
for a in range(len(X)):
    for b in range(len(X)-a):
        if len(X)-b-a<K:
            break
        for c in range(len(Y)):
            for d in range(len(Y)-c):
                cnt=0
                for e in range(a,len(X)-b):
                    if X[a]<=D[e][0]<=X[len(X)-1-b] and Y[c]<=D[e][1]<=Y[len(Y)-1-d]:
                        cnt+=1
                if cnt>=K and ans>abs(X[a]-X[len(X)-1-b])*abs(Y[c]-Y[len(Y)-1-d]):
                    ans=abs(X[a]-X[len(X)-1-b])*abs(Y[c]-Y[len(Y)-1-d])
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
N,K=map(int,input().split())
D=[]
X=[]
Y=[]

for i in range(N):
    x,y=map(int,input().split())
    D.append([x,y])
    X.append(x)
    Y.append(y)
    
X.sort()
Y.sort()
ans=10**20
for a in range(len(X)):
    for b in range(len(X)-a):
        for c in range(len(Y)):
            for d in range(len(Y)-c):
                cnt=0
                for e in range(N):
                    if X[a]<=D[e][0]<=X[len(X)-1-b] and Y[c]<=D[e][1]<=Y[len(Y)-1-d]:
                        cnt+=1
                if cnt>=K and ans>abs(X[a]-X[len(X)-1-b])*abs(Y[c]-Y[len(Y)-1-d]):
                    ans=abs(X[a]-X[len(X)-1-b])*abs(Y[c]-Y[len(Y)-1-d])
print(ans)

Fixed submission:
N,K=map(int,input().split())
D=[]
X=[]
Y=[]

for i in range(N):
    x,y=map(int,input().split())
    D.append([x,y])
    X.append(x)
    Y.append(y)
    
X.sort()
Y.sort()
D.sort()
ans=10**20
for a in range(len(X)):
    for b in range(len(X)-a):
        if len(X)-b-a<K:
            break
        for c in range(len(Y)):
            for d in range(len(Y)-c):
                cnt=0
                for e in range(a,len(X)-b):
                    if X[a]<=D[e][0]<=X[len(X)-1-b] and Y[c]<=D[e][1]<=Y[len(Y)-1-d]:
                        cnt+=1
                if cnt>=K and ans>abs(X[a]-X[len(X)-1-b])*abs(Y[c]-Y[len(Y)-1-d]):
                    ans=abs(X[a]-X[len(X)-1-b])*abs(Y[c]-Y[len(Y)-1-d])
print(ans)