I'm sure I got WA because of reading string.
Please help me, thanks.
Here is my code to read string :
...
fscanf(stdin,"%d\n",&m) ;
   for(int i=0;i<m;i++) {
       char s[1000] ;
         int j = 0 , k = 0 ;
         fscanf(stdin,"%s",&s) ;
         while ( s[j] != ',' ) a[i].x = a[i].x * 10 + s[j++] - 48 ;
         j++ ;
         while ( s[j] != ':' ) a[i].y = a[i].y * 10 + s[j++] - 48 ;
         j++ ;
         while (j < strlen(s) ) {
               while ( s[j] != '-' ) b[i][k] = b[i][k] * 10 + s[j++] - 48 ;
               j++ ;
               while ( j < strlen(s) && s[j] != ',' ) c[i][k] = c[i][k] * 10 + s[j++] - 48 ;
               k++ ;
               if ( s[j] == '\n' ) { j++ ; break ; }
               j++ ;
         }
         deg[i] = k ;
     }

scanf("%d\n",&n);
    int i;
    int id,x,y,r;
    for (i = 0 ; i<n ; i++){
        scanf("%d,%d:",&x,&y);
        while (true){
            scanf("%d-%d",&id,&r);

            a[id][cnt[id]].x = x;
            a[id][cnt[id]].y = y;
            a[id][cnt[id]].r = r;
            cnt[id]++;
            char ch;

            ch = getc(stdin);
            if (ch!=',') break;
        }

    }

or:
for (int i=0; i<m; i++){
     char buf;
     cin >> tmp.x >> buf >> tmp.y;
     while ((buf=cin.get())!='\n' && buf!=EOF){
      int id;
      cin >> id >> buf >>tmp.r;
      a[id].push_back(tmp);
     }
}