C++简洁代码：
挂科危险
http://www.nowcoder.com/questionTerminal/0b62b8dca766459ca3935a499a737d9f
C++简洁代码：
#include<bits/stdc++.h>
using namespace std;
int main () {
int core;
string res;
cin >> core;
if (core >= 10) res = "Danger++";
else if (core >= 4 && core <= 9) res = "Danger";
else res = "Good";
cout << res << endl;
return 0;
}
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