Codeforces 523C - Name Quest 手速题

//还是too young，因为没初始化len_name, len_str wa了一发

 1 #include "bits\stdc++.h"
 2 using namespace std;
 3 char name[1010], str[1000010];
 4
 5 int main()
 6 {
 7     scanf("%s %s", name, str);
 8     int len_name = strlen(name), len_str = strlen(str);
 9     int i, j;
10     int pos_1, pos_2;
11     pos_1 = len_str;
12     pos_2 = -1;
13     for(i = j = 0; i < len_str; ++i) {
14         if(str[i] == name[j]) {
15             ++j;
16             if(j == len_name) {
17                 pos_1 = i;
18                 break;
19             }
20         }
21     }
22     for(i = len_str - 1, j = len_name - 1; i >= 0; --i) {
23         if(str[i] == name[j]) {
24             --j;
25             if(j == -1) {
26                 pos_2 = i;
27                 break;
28             }
29         }
30     }
31     printf("%d\n", max(0, pos_2 - pos_1));
32 }