紫书第六章UVA 442

/*Sample Input
9
A 50 10
B 10 20
C 20 5
D 30 35
E 35 15
F 15 5
G 5 10
H 10 20
I 20 25
A
B
C
(AA)
(AB)
(AC)
(A(BC))
((AB)C)
(((((DE)F)G)H)I)
(D(E(F(G(HI)))))
((D(EF))((GH)I))
Sample Output
0
0
0
error
10000
error
3500
15000
40500
47500
15125*/
#include <iostream>
#include <stack>
#include<vector>
#include<string>
#include<map>
using namespace std;
struct ju{
int z,y;
ju(int a=0,int b=0)
{
    z=a;
    y=b;
}
};
ju m[26];
stack <ju> j;
int main()
{
    int n;
    cin>>n;
    for(int i=0;i<n;i++)
    {
        string name;
        cin>>name;
        int k=name[0]-'A';
        cin>>m[k].z>>m[k].y;
    }
    string s;
    while(cin>>s)
    {
        int sum=0,flag=0;
        for(int i=0;i<s.length();i++)
        {
            if(s[i]=='(')
                continue;
            else if(isalpha(s[i]))
            {
                j.push(m[s[i]-'A']);
            }
            else if(s[i]==')')
            {
                ju t2=j.top();
                j.pop();
                ju t1=j.top();
                j.pop();
                if(t1.y!=t2.z)
                    {
                        cout<<"error"<<endl;
                        flag=1;
                        break;
                    }
                else{
                    j.push(ju(t1.z,t2.y));
                    sum+=(t1.z*t2.z*t2.y);
                }
            }

        }
        if(!flag)
                cout<<sum<<endl;
    }
   // cout << "Hello world!" << endl;
    return 0;
}