【杭电acm】1022 Train Problem I

 1 #include <stdio.h>
 2 #include <string.h>
 3 
 4 #define MAXNUM 1005
 5 
 6 char in[MAXNUM];
 7 char out[MAXNUM];
 8 char stack[MAXNUM];
 9 char order[MAXNUM]; // 1:in, 0:out
10 
11 int main() {
12     int n;
13     int i, j, k, tmp, flg;
14     int top;
15 
16     while (scanf("%d %s %s", &n, in, out) != EOF) {
17         top = k = 0;
18         for (i=0; in[i]!=out[0]&&i<n; ++i) {
19             stack[top++] = in[i];
20             order[k++] = 1;
21         }
22         tmp = i+1;
23         order[k++]=1; order[k++]=0;
24         flg = 0;
25         for (i=1; i<n; ++i) {
26             if (top) {
27                 if (stack[top-1] == out[i]) {
28                     --top;
29                     order[k++] = 0;
30                     continue;
31                 }
32                 for (j=0; j<top-1; ++j) {
33                     if (stack[j] == out[i]) {
34                         printf("No.\nFINISH\n");
35                         flg = 1;
36                         break;
37                     }
38                 }
39             }
40             if (flg)
41                 break;
42             for (j=tmp; in[j]!=out[i]&&j<n; ++j) {
43                 stack[top++] = in[j];
44                 order[k++] = 1;
45             }
46             tmp = j+1;
47             order[k++]=1; order[k++]=0;
48         }
49         if (flg)
50             continue;
51         printf("Yes.\n");
52         for (i=0; i<k; ++i)
53             if (order[i])
54                 printf("in\n");
55             else
56                 printf("out\n");
57         printf("FINISH\n");
58     }
59 
60     return 0;
61 }