Alaska

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Problem B: Alaska

The Alaska Highway runs 1422 miles from Dawson Creek, British Columbia to Delta Junction, Alaska. Brenda would like to be the first person to drive her new electric car the length of the highway. Her car can travel up to 200 miles once charged at a special charging station. There is a charging station in Dawson Creek, where she begins her journey, and also several charging stations along the way. Can Brenda drive her car from Dawson City to Delta Juntion and back?

输入要求

The input contains several scenario. Each scenario begins with a line containing n, a positive number indicating the number of charging stations. nlines follow, each giving the location of a filling station on the highway, including the one in Dawson City. The location is an integer between 0 and 1422, inclusive, indicating the distance in miles from Dawson Creek. No two filling stations are at the same location. A line containing 0 follows the last scenario.

输出要求

For each scenario, output a line containing POSSIBLE if Brenda can make the trip. Otherwise, output a line containing the word IMPOSSIBLE.

假如输入

应当输出

IMPOSSIBLE
POSSIBLE

be careful：读题一定要细致

#include<iostream>
#include<algorithm>
#include <vector>
#include<string.h>
#include<ctype.h>
using namespace std;
void fun();
int main()
{
	fun();
	return 0;
}
void fun()
{
	int i,n,arr[1500],flag;
	while(cin>>n&&n)
	{
		flag=1;
		for(i=0;i<n;i++)
			cin>>arr[i];
		sort(arr,arr+n,greater<int>());
		if(1422-arr[0]>100||arr[n-1]>100)//这是个大坑，是来回。所以需大于100不能到达
			flag=0;
		for(i=0;i<n&&flag;i++)
		{
			if(arr[i]-arr[i+1]>200)
			{
				flag=0;
				break;
			}
		}
		if(flag)
			cout<<"POSSIBLE"<<endl;
		else
			cout<<"IMPOSSIBLE"<<endl;
	}
}