Code

#include <stdio.h>
int n, a[107];
int main()
{
	scanf("%d", &n);
	for(int i = 1; i <= n + 1; i++) scanf("%d", a + i);
	if(a[1] < 0 and a[1] != -1) printf("%dx^%d", a[1], n);
	else if(a[1] < 0 and a[1] == -1) printf("-x^%d", n);
	else if(a[1] > 0 and a[1] != 1) printf("%dx^%d", a[1], n);
	else if(a[1] > 0 and a[1] == 1)printf("x^%d", n);
	bool flag = false;
	if(a[1]) flag = true;
	for(int i = 2; i < n; i++) 
	{
		if(flag)
		{
			if(a[i] < 0 and a[i] != -1) printf("%dx^%d", a[i], n - i + 1);
			else if(a[i] < 0 and a[i] == -1) printf("-x^%d", n - i + 1);
			else if(a[i] > 0 and a[i] != 1) printf("+%dx^%d", a[i], n - i + 1);
			else if(a[i] > 0 and a[i] == 1)printf("+x^%d", n - i + 1);	
		}
		else
		{
			if(a[i] < 0 and a[i] != -1) printf("%dx^%d", a[i], n - i + 1);
			else if(a[i] < 0 and a[i] == -1) printf("-x^%d", n - i + 1);
			else if(a[i] > 0 and a[i] != 1) printf("%dx^%d", a[i], n - i + 1);
			else if(a[i] > 0 and a[i] == 1)printf("x^%d", n - i + 1);
		}
		if(a[i]) flag = true;
	}
	if(a[n] < 0 and a[n] != -1) printf("%dx", a[n]);
	else if(a[n] == -1) printf("-x");
	else if(a[n] > 0 and a[n] != 1) printf("+%dx", a[n]);
	else if(a[n] == 1) printf("+x");
	n++;
	if(a[n] < 0) printf("%d", a[n]);
	else if(a[n] > 0) printf("+%d", a[n]);
	return 0;
}