AC！！！很好用！！！

#include <bits/stdc++.h>
using namespace std;
int main(void)
{int n;scanf("%d", &n);int a[101] = { 0 };for (int i = 0; i <= n; i++){scanf("%d", &a[i]);}for (int i = 0; i <= n; i++){if (a[0] && i == 0 && abs(a[i]) != 1){printf("%dx^%d", a[i], n);}if (a[0] && i == 0 && abs(a[i]) == 1){if (a[i] == 1){printf("x^%d", n);}else{printf("-x^%d", n);}}if (a[i] > 0 && i != n && i != 0 && i != n - 1 && abs(a[i]) != 1){printf("+%dx^%d", a[i], n - i);}if (a[i] < 0 && i != n&&i!=n-1 && i != 0 && abs(a[i]) != 1){printf("%dx^%d", a[i], n - i);}if (a[i] && i != n && i != 0 &&i!=n-1&& abs(a[i]) == 1){if (a[i] == 1){printf("+x^%d", n - i);}else{printf("-x^%d", n - i);}}if (i == n - 1 && a[i] > 0 && abs(a[i]) != 1){printf("+%dx");}if (i == n - 1 && a[i] < 0 && abs(a[i]) != 1){printf("%dx");}if (i == n - 1 && abs(a[i]) == 1){if (a[i] == 1){printf("+x");}else{printf("-x");}}if (i == n && a[i] > 0){printf("+%d", a[i]);}if (i == n && a[i] < 0){printf("%d", a[i]);}}return 0;}