POJ1002 runtime error 求解释，感谢。

//希望各位朋友不吝赐教，在下感激不尽~

#include<stdio.h>#include<stdlib.h>#include<string.h>//#include<algorithm>//using namespace std;char map[26]={'2','2','2','3','3','3','4','4','4','5','5','5','6','6','6','7','Q','7','7','8','8','8','9','9','9','Z'} ;int Cmp(const void* a, const void* b){return strcmp((char *)a  ,(char *)b);}int main(){int n;int i;char str[1000][9];memset(str,0,sizeof(str));scanf("%d\n",&n);for(i=0 ; i<n ; i++){int x=0;int j;char buff[1000];memset(buff,0,sizeof(buff));scanf("%s",buff);for(j=0;buff[j]!='\0';j++)   //buff[j]{if(buff[j]=='-') continue;if(buff[j]>='A' && buff[j]<='Z') buff[j]=map[buff[j]-'A'];str[i][x++]=buff[j];if(x==3) str[i][x++]='-';}if(x==8) str[i][x]='\0';}qsort( str , n , 9 , Cmp ) ;//sort(str,str+n-1);int k=1;int m;int flag=1;for(m=1 ; m<n ; m++){if(  strcmp(str[m-1],str[m]) )  //not equal in{if(k>1) {printf("%s %d\n",str[m-1],k);flag=0;}k=1;}else    //equal in k++{k++;}}if(k>1) {printf("%s %d\n",str[m-1],k); flag=0;}if(flag) printf("No duplicates.\n");system("PAUSE");return 0;}