算术表达式文法

#include<bits/stdc++.h>
#define ROW 6
#define COLUMN 9
using namespace std;
string table[ROW][COLUMN]= {
    {"","(",")","*","+","-","/","i","#"},
    {"E","Te","","","","","","Te",""},
    {"e","","ε","","+Te","-Te","","","ε"},
    {"T","Ft","","","","","","Ft",""},
    {"t","","ε","*Ft","ε","ε","/Ft","","ε"},
    {"F","(E)","","","","","","i",""}
};
string Get_table(string x,string a) {
     string ans="";
    for(int i&#