哈希表

#include<unordered_map>
#include<stdio.h>

std::unordered_map<int,char>hash={{10,'A'},{9,'A'},{8,'B'},{7,'C'},{6,'D'},{5,'E'},
{4,'E'},{3,'E'},{2,'E'},{1,'E'},{0,'E'}};

int main(){
    int n;
    scanf("%d",&n);
    printf("%c",hash[n/10]);
    return 0;
}