很小

#include<ostream>
int n,a[101],y,i;int main(){scanf("%d",&n);for(i=n;i>=0;i--)scanf("%d",&a[i]);for(i=n;i>=0;i--){if(a[i]){if(a[i]>0){if(i!=n)printf("+");}else printf("-");y=abs(a[i]);if(y!=1||!i)printf("%d",y);if(i>=2)printf("x^%d",i);if(i==1)printf("x");}}}