/in/foo.cc: In function 'int main()':
/in/foo.cc:43:50: warning: format '%s' expects argument of type 'char*', but argument 4 has type 'char (*)[10]' [-Wformat=]
   scanf("%d%d%s",&edge[i].x,&edge[i].y,&edge[i].s);
                                                  ^
/in/foo.cc:55:7: warning: unused variable 'flag' [-Wunused-variable]
  bool flag = 0;
       ^~~~