为什么输入The C Programming Language ram后就无法输入了？

#include <stdio.h>
#define MAXS 30

char *search(char *s, char t);
void ReadString( char s[] ); / 裁判提供，细节不表 */

int main()
{
char s[MAXS], t[MAXS], *pos;

ReadString(s);
ReadString(t);
pos = search(s, t);
if ( pos != NULL )
    printf("%d\n", pos - s);
else
    printf("-1\n");

return 0;

}

/* 你的代码将被嵌在这里 */

char *search( char *s, char t )
{
int flag=1;
char b;
while(s!='\0')
{
if(s==t)
{
b=t;
for(;(t++)!='\0';)
{
if((s++)!=(t))
flag=0;
}
if(flag==1)
{
return b;
}
}
s++;
}
return NULL;
}

供参考：

#include <stdio.h>
#define MAXS 30
char* search(char* s, char* t);
void  ReadString( char s[] ); /*裁判提供，细节不表*/
int main()
{
    char s[MAXS], t[MAXS], * pos;
    ReadString(s);
    ReadString(t);
    pos = search(s, t);
    if (pos != NULL)
        printf("%d", pos - s);
    else
        printf("Not Found");

    return 0;
}
/* 你的代码将被嵌在这里 */
char* search(char* s, char* t)
{
    int i, j, k, flg;
    char* pos = NULL;
    for (i = 0, flg = 1; flg && s[i] != '\0'; i++)
        for (j = i, k = 0; t[k] == s[j]; k++, j++)
            if (t[k + 1] == '\0') { pos = s + i; flg = 0; break; }
    return pos;
}