Buggy python submission (verdict: Runtime Error):
N=int(input())
A=[int(i) for i in input().split()]
B=[int(i) for i in input().split()]
count=0
if sum(A)<sum(B):
    print(-1)
else:
    dif=[A[i]-B[i] for i in range(N)]
    if min(dif)>=0:
        print(0)
    else:
        difsort=sorted(dif)
        pluslist=[i for i in difsort if i>=0][::-1]
        minlist=[i for i in difsort if i<0]
        minum=len(minlist)
        absum=abs(sum(minlist))
        sumlist=[sum(pluslist[0:i+1]) for i in range(len(pluslist)-1)]
        while sumlist[count]<absum:
            count+=1
        
        print(count+1+minum)

Fixed submission:
N=int(input())
A=[int(i) for i in input().split()]
B=[int(i) for i in input().split()]
count=0
if sum(A)<sum(B):
    print(-1)
else:
    dif=[A[i]-B[i] for i in range(N)]
    if min(dif)>=0:
        print(0)
    else:
        difsort=sorted(dif)
        plist=[i for i in difsort if i>=0][::-1]
        mlist=[i for i in difsort if i<0]
        mnum=len(mlist)
        msum=sum(mlist)
        for i in range(len(plist)):
            if msum>=0:
                break
            msum+=plist[i]
            count+=1
            
        
        print(count+mnum)

Buggy python submission (verdict: Runtime Error):
N=int(input())
A=[int(i) for i in input().split()]
B=[int(i) for i in input().split()]
count=0
if sum(A)<sum(B):
    print(-1)
else:
    dif=[A[i]-B[i] for i in range(N)]
    if min(dif)>=0:
        print(0)
    else:
        difsort=sorted(dif)
        pluslist=[i for i in difsort if i>=0][::-1]
        minlist=[i for i in difsort if i<0]
        minum=len(minlist)
        absum=abs(sum(minlist))
        sumlist=[sum(maxsort[0:i+1]) for i in range(len(pluslist)-1)]
        while sumlist[count]<absum:
            count+=1
        
        print(count+1+minum)

Fixed submission:
N=int(input())
A=[int(i) for i in input().split()]
B=[int(i) for i in input().split()]
count=0
if sum(A)<sum(B):
    print(-1)
else:
    dif=[A[i]-B[i] for i in range(N)]
    if min(dif)>=0:
        print(0)
    else:
        difsort=sorted(dif)
        plist=[i for i in difsort if i>=0][::-1]
        mlist=[i for i in difsort if i<0]
        mnum=len(mlist)
        msum=sum(mlist)
        for i in range(len(plist)):
            if msum>=0:
                break
            msum+=plist[i]
            count+=1
            
        
        print(count+mnum)

Buggy python submission (verdict: Time Limit Exceeded):
N=int(input())
A=[int(i) for i in input().split()]
B=[int(i) for i in input().split()]
count=0
if sum(A)<sum(B):
    print(-1)
else:
    dif=[A[i]-B[i] for i in range(N)]
    if min(dif)>=0:
        print(0)
    else:
        difsort=sorted(dif)
        pluslist=[i for i in difsort if i>=0]
        zero=difsort.index(pluslist[0])
        minum=len(difsort[:zero])
        maxsort=difsort[::-1]
        absum=abs(sum(difsort[:zero]))
        sumlist=[sum(maxsort[0:i+1]) for i in range(len(pluslist))]
        while sumlist[count]<absum:
            count+=1
        
        print(count+1+minum)

Fixed submission:
N=int(input())
A=[int(i) for i in input().split()]
B=[int(i) for i in input().split()]
count=0
if sum(A)<sum(B):
    print(-1)
else:
    dif=[A[i]-B[i] for i in range(N)]
    if min(dif)>=0:
        print(0)
    else:
        difsort=sorted(dif)
        plist=[i for i in difsort if i>=0][::-1]
        mlist=[i for i in difsort if i<0]
        mnum=len(mlist)
        msum=sum(mlist)
        for i in range(len(plist)):
            if msum>=0:
                break
            msum+=plist[i]
            count+=1
            
        
        print(count+mnum)

Buggy python submission (verdict: Runtime Error):
N=int(input())
A=[int(i) for i in input().split()]
B=[int(i) for i in input().split()]
count=0
if sum(A)<sum(B):
    print(-1)
else:
    dif=[A[i]-B[i] for i in range(N)]
    if min(dif)>=0:
        print(0)
    else:
        difsort=sorted(dif)
        pluslist=[i for i in difsort if i>=0]
        zero=difsort.index(pluslist[0])
        minum=len(difsort[:zero])
        maxsort=difsort[::-1]
        absum=abs(sum(difsort[:zero]))
        sumlist=[sum(maxsort[0:i+1]) for i in range(len(pluslist)-1)]
        while sumlist[count]<absum:
            count+=1
        
        print(count+1+minum)

Fixed submission:
N=int(input())
A=[int(i) for i in input().split()]
B=[int(i) for i in input().split()]
count=0
if sum(A)<sum(B):
    print(-1)
else:
    dif=[A[i]-B[i] for i in range(N)]
    if min(dif)>=0:
        print(0)
    else:
        difsort=sorted(dif)
        plist=[i for i in difsort if i>=0][::-1]
        mlist=[i for i in difsort if i<0]
        mnum=len(mlist)
        msum=sum(mlist)
        for i in range(len(plist)):
            if msum>=0:
                break
            msum+=plist[i]
            count+=1
            
        
        print(count+mnum)

Buggy python submission (verdict: Time Limit Exceeded):
N=int(input())
A=[int(i) for i in input().split()]
B=[int(i) for i in input().split()]
count=0
if sum(A)<sum(B):
    print(-1)
else:
    dif=[A[i]-B[i] for i in range(N)]
    if min(dif)>=0:
        print(0)
    else:
        difsort=sorted(dif)
        pluslist=[i for i in difsort if i>=0]
        zero=difsort.index(pluslist[0])
        minum=len(difsort[:zero])
        maxsort=difsort[::-1]
        while sum(maxsort[0:count+1])<abs(sum(difsort[:zero])):
            count+=1
        
        print(count+1+minum)

Fixed submission:
N=int(input())
A=[int(i) for i in input().split()]
B=[int(i) for i in input().split()]
count=0
if sum(A)<sum(B):
    print(-1)
else:
    dif=[A[i]-B[i] for i in range(N)]
    if min(dif)>=0:
        print(0)
    else:
        difsort=sorted(dif)
        plist=[i for i in difsort if i>=0][::-1]
        mlist=[i for i in difsort if i<0]
        mnum=len(mlist)
        msum=sum(mlist)
        for i in range(len(plist)):
            if msum>=0:
                break
            msum+=plist[i]
            count+=1
            
        
        print(count+mnum)