题解 | 多项式输出

import sys
n=int(input())
num=list(map(int,sys.stdin.read().split()))
res = ""
for i in range(0,n+1):
    if num[i]==0:
        continue   
    if num[i]<0:
        res+='-'
    if num[i]>0 and i!=0:
        res+="+"
    if num[i]==1 or num[i]==-1:
        if n-i!=0:
            res+="x"
        else:
            res+="1"
        
    else:
        res+=str(abs(num[i]))
        if n!=i:
            res+="x"
    
    if n-i<=1:
        continue
    else:
        res+="^"
        res+=str(n-i)
print(res)