n=int(input()) L=list(map(int,input().split())) l=list(map(int,input().split())) s=0 for i in range(n):     if L[i]+L[i+1]<=l[i]:         s+=L[i]+L[i+1]     elif L[i]<l[i] and L[i]+L[i+1]>l[i]:         L[i+1]-=l[i]-L[i]         s+=l[i]     else:         s+=l[i] print(s)有老哥帮忙看下第二题代码哪错了吗,实在想不通为啥是0
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