问题 B: Expired?

时间限制: 1 Sec  内存限制: 128 MB
提交: 165  解决: 73
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题目描述

Takahashi has a strong stomach. He never gets a stomachache from eating something whose "best-by" date is at most X days earlier. He gets a stomachache if the "best-by" date of the food is X+1 or more days earlier, though.
Other than that, he finds the food delicious if he eats it not later than the "best-by" date. Otherwise, he does not find it delicious.
Takahashi bought some food A days before the "best-by" date, and ate it B days after he bought it.
Write a program that outputs delicious if he found it delicious, safe if he did not found it delicious but did not get a stomachache either, and dangerous if he got a stomachache.

Constraints
1≤X,A,B≤109

输入

Input is given from Standard Input in the following format:
X A B

输出

Print delicious if Takahashi found the food delicious; print safe if he neither found it delicious nor got a stomachache; print dangerous if he got a stomachache.

样例输入

4 3 6

样例输出

safe

提示

He ate the food three days after the "best-by" date. It was not delicious or harmful for him.

解析：题目很简单，可能出错的地方我已经用红字标出了。

#include <iostream>

using namespace std;

int main()
{
    long long x, a, b;
    while(cin>>x>>a>>b){
        if(b <= a+1)
            cout<<"delicious"<<endl;
        else if(b <= a+x)
            cout << "safe" << endl;
        else
            cout << "dangerous"<<endl;
    }
    return 0;
}