题解

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