C :

#include <stdio.h>

typedef struct
{
	int x, y;
} bdd;

int main()
{
	int i, j, k, m, n;
	bdd r[1000];
	while (scanf("%d", &n) != EOF)
	{
		for (i = 0; i <= n; ++i)
		{
			scanf("%d", &r[i].x);
			r[i].y = n - i;
		}
		if (0 == n)
		{
			printf("%d\n", r[0].x);
		}
		else
		{
			if (r[0].x)
			{
				if (1 == r[0].x)
				{
					printf("x^%d", r[0].y);
				}
				else if (-1 == r[0].x)
				{
					printf("-x^%d", r[0].y);
				}
				else
				{
					printf("%dx^%d", r[0].x, r[0].y);
				}
			}
			for (i = 1; i < n; ++i)
			{
				if (r[i].x)
				{
					if (-1 == r[i].x)
					{
						printf("-x");
						if (1 != r[i].y)
						{
							printf("^%d", r[i].y);
						}
					}
					else if (1 == r[i].x)
					{
						printf("+x");
						if (1 != r[i].y)
						{
							printf("^%d", r[i].y);
						}
					}
					else
					{
						printf("%+dx", r[i].x);
						if (1 != r[i].y)
						{
							printf("^%d", r[i].y);
						}
					}
				}
			}
			if (r[n].x)
			{
				printf("%+d\n", r[n].x);	
			}
			else
			{
				putchar('\n');
			}
		}
	}
	return 0;
}

C++ :

#include<iostream>
#include<string>
using namespace std;
int main()
{
	int n; string str="x^";
	while (cin>>n)
	{
		int first=1;
		while (n!=-1)
		{
			int a; cin>>a;
			if ( first && a )//1
			{
				if (a<0) { cout<<"-";a=-a; }
				if (a==1) cout<<str<<n;
				else cout<<a<<str<<n; 
				goto end;
			} 
			if ( n==1 && a)
			{
				if (a<0) { cout<<"-";a=-a; } else cout<<"+";
				if (a==1) cout<<"x";
				else cout<<a<<"x";goto end;
			}
			if ( n==0 && a)
			{
				if (a>0) cout<<"+"; cout<<a; goto end;
			}
			if (a)
			{
				if (a<0) { cout<<"-";a=-a; } else cout<<"+";
				if (a==1) cout<<str<<n;
				else cout<<a<<str<<n;
				goto end;
			}
			
		end:	first=0;n--;
		}
		cout<<endl;
	}
	return 0;
} 

Pascal :

var i,j,m,n,k,ans:longint;
begin
  readln(n);
  for i:=n downto 0 do
  begin
    read(k);
    if k=0 then continue ;
    if k<0 then write('-');
    if (k>0) and (i<>n) then write('+');
    if (k<>1) and (k<>-1) or (i=0) then write(abs(k));
    if i>1 then write('x^',i);
    if i=1 then write('x');
  end;
end.

Java :

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {
	public static void main(String args[]) throws Exception {
		// 输入范围
		Scanner scanner = new Scanner(System.in);
		String input = scanner.nextLine();
		Integer n = Integer.parseInt(input);

		input = scanner.nextLine();
		String[] array = input.split(" ");
		List<Integer> numList = new ArrayList<Integer>();
		for (int i = 0; i < array.length; i++) {
			numList.add(Integer.parseInt(array[i]));
		}

		String output = "";
		int head = 0;

		for (int i = 0; i < numList.size(); i++) {

			if (numList.get(i) <= -2) {
				output += String.valueOf(numList.get(i));
			} else if (numList.get(i) == -1) {
				if (n == 0) {
					output += "-1";
				} else {
					output += "-";
				}
			} else if (numList.get(i) == 0) {
				head++;
			} else if (numList.get(i) == 1) {
				if (n == 0) {
					if (i == head) {
						output += "1";
					} else {
						output += "+1";
					}
				} else {
					if (i != head) {
						output += "+";
					}
				}
			} else if (numList.get(i) > 1) {
				if (i != head) {
					output += "+";
				}
				output += numList.get(i);
			}

			if (numList.get(i) != 0) {
				if (n != 0) {
					output += "x";
				}
			}

			if (numList.get(i) != 0) {
				if (n > 1) {
					output += "^" + n;
				}
			}
			n--;
		}

		System.out.println(output);

	}
}