题解 | 挂科危险

#include <stdio.h>

int main() {
    int a=0;
    while(scanf("%d",&a)!=EOF)
    {
        if(a>=0&&a<=3)
        printf("Good");
        else if(a>=4&&a<=9)
        printf("Danger");
        else if(a>=10)
        printf("Danger++");
    }
    
    return 0;
}