#include     using namespace std;    struct GL {
        bool tag;
    int data1;
    GL *data2;
    GL *link;
}G[100];    void main() { <--------有問題
        int i=0 ,j=0 ,k=0;
        char A[50];            for (i=0 ;i<50 ;i  )
                A[i] = 0;
        cout << "請輸入多項式(請勿超過50個字)，預設輸入 : A=[a,(b,c),()]" << endl;
        cin >> A;
        cout << "輸出結果為 : ";            for (i=0 ;i<=49 ;i  ) {
                if (A[i] >= 'A' && A[i] <= 'Z')
                        cout << A[i];
                else if (A[i] == '=')
                        cout << A[i];
                else if (A[i] == '[')
                        cout << A[i];
                else if (A[i] >= 'a' && A[i] <= 'z') {
                        G[j].tag = 0;
                        G[j].data1 = A[i];
                        cout << A[i];
                }
                else if (A[i] == ',') {
                        cout << A[i];
                        if (A[i-1] = ')')
                                j  ;
                        else {
                                G[j].link = &G[j 1];
                            j  ;
                        }
                }
                else if (A[i] == '(') {
                        k = j;
                        if (A[i 1] == ')') {
                                G[j].tag = 1;
                            G[j].data1 = 0;
                        }
                        else {
                                G[j].tag = 1;
                            G[j].data2 = &G[j 1];
                                j  ;
                        }
                        cout << A[i];
                }
                else if (A[i] == ')') {
                        if (A[i 1] == ',') {
                                G[k].link = &G[j 1];
                                G[j].link = NULL;
                                cout << A[i];
                        }
                        else {
                                G[j].link = NULL;
                            cout << A[i];
                        }
                }
                else
                        cout << A[i];
        }
        cout << endl;
}