样例都过了，但是30pts,求看一看

#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    int cnt=n;
    int a[105];
    if(n==0){
        int q;
        cin>>q;
        cout<<q;
        return 0;
    }
    int tt=0;
    for(int i=1;i<=n+1;i++){
        cin>>a[i];
        tt+=a[i];
    }
    for(int i=1;i<=n+1;i++){
        if(i==n+1){
            if(a[n+1]>0){
                if(tt==a[n+1]){
                    cout<<a[n+1];
                }
                else cout<<'+'<<a[n+1];
            }
            else if(a[n+1]<0){
                cout<<a[n+1];
            }
            break;
        }
        else if(i==n){
            if(a[i]==0)continue;
            else if(a[i]==1){
                cout<<"+x";
                continue;
            }
            else if(a[i]==-1){
                cout<<"-x";
                continue;
            }
            else if(a[i]>0&&a[i]!=1){
                cout<<"+"<<a[i]<<"x";
            }
            else if(a[i]<0&&a[i]!=-1){
                cout<<"-"<<a[i]<<"x";
            }
        }
        else if(i==1){
            if(a[1]==0)continue;
            if(a[1]==1)cout<<"x^"<<cnt;
            else if(a[1]==-1){
                cout<<'-'<<"x^"<<cnt;
            }
            else{
                cout<<a[i]<<"x^"<<cnt;
            }
        }
        else{
            if(a[i]==0){
                continue;
            }
            else if(a[i]>0){
                if(a[i]==1)cout<<"+x^"<<cnt;
                else cout<<"+"<<a[i]<<"x^"<<cnt;
            }
            else if(a[i]<0){
                if(a[i]==-1)cout<<"-x^"<<cnt;
                else cout<<a[i]<<"x^"<<cnt;
            }
        }
        cnt--;
    }
    return 0;
}