高精除低精
cpp
vector<int> div(vector<int> &A,int b){
vector<int> C;
int r=0;
for(int i=A.size()-1;i>=0;i--){
r=r*10+A[i];
C.push_back(r/b);
r%=b;
}
reverse(C.begin(),C.end());
while(C.size()>1&&C.back()==0)C.pop_back();
return C;
}