/in/foo.cc: In function 'int main()':
/in/foo.cc:20:57: warning: format '%s' expects argument of type 'char*', but argument 4 has type 'char (*)[20]' [-Wformat=]
   scanf("%d %s %s %d",&s[i].bh,s[i].mz,&s[i].hm,&s[i].sj); 
                                                         ^