Posted on 2008-03-23 22:12
superman 阅读(704)
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ZOJ
1 /* Accepted 1094 C++ 00:00.00 844K */
2 #include <map>
3 #include <stack>
4 #include <string>
5 #include <iostream>
6
7 using namespace std;
8
9 struct Matrix { int r, c; };
10
11 int main()
12 {
13 int n;
14 char name;
15 map<char, Matrix> matrix;
16
17 cin >> n;
18 for(int i = 0; i < n; i++)
19 {
20 cin >> name;
21 cin >> matrix[name].r >> matrix[name].c;
22 }
23
24 string exp;
25 while(cin >> exp)
26 {
27 if(exp.size() == 1)
28 {
29 cout << 0 << endl;
30 continue;
31 }
32
33 int i, count = 0;
34 stack<Matrix> mst;
35 for(i = 0; i < exp.size(); i++)
36 {
37 if(exp[i] == '(')
38 continue;
39 if(exp[i] == ')')
40 {
41 Matrix b = mst.top(); mst.pop();
42 Matrix a = mst.top(); mst.pop();
43 if(a.c != b.r)
44 {
45 cout << "error" << endl;
46 break;
47 }
48 count += a.r * b.r * b.c;
49 Matrix tmp = {a.r, b.c};
50 mst.push(tmp);
51 }
52 else
53 mst.push(matrix[exp[i]]);
54 }
55 if(i == exp.size())
56 cout << count << endl;
57 }
58
59 return 0;
60 }
61