POJ-22551

#include<stdio.h>#include<string.h>int n;void find(char *src, char *str, char *c, char *left, char *right){     char *cnext;       if (left == right) {        printf("%c", *c);        return;     }     cnext = strchr(src, *(str+n));     if (cnext >= left && cnext <= c) {       n++;       find(src, str, cnext, left, c-1);     }     cnext = strchr(src, *(str+n));     if (cnext >= c && cnext <= right) {       n++;       find(src, str, cnext, c+1, right);     }          printf("%c", *c);     }main(){      char str[27], src[27];      while (scanf("%s %s", str, src) != EOF) {            n = 1;            find(src, str, strchr(src, *str), src, src+strlen(src)-1);            printf("\n");      }   }