把模拟ac了

#include<iostream>
#include<cmath>
using namespace std;
int n;
int a[105];
int main(){
    cin>>n;
    for(int i=1;i<=n+1;i++){
        cin>>a[i];
    }
    //a[1]
    if(a[1]==1) cout<<"x^"<<n;
    else if(a[1]==-1) cout<<"-x^"<<n;
    else cout<<a[1]<<"x^"<<n;
    //a[2]-a[n]
    for(int i=2;i<=n;i++){
        if(a[i]>0) cout<<"+";
        else if(a[i]<0) cout<<"-";
        else continue;
        a[i]=abs(a[i]);
        if(a[i]!=1) cout<<a[i];
        cout<<"x";
        if(n-i+1!=1) cout<<"^"<<n-i+1;
    }
    //a[n+1]
    if(a[n+1]>0) cout<<"+"<<a[n+1];
    else if(a[n+1]<0) cout<<"-"<<abs(a[n+1]);
}