/in/foo.cc: In function 'int main()':
/in/foo.cc:14:23: error: 'memset' was not declared in this scope
   memset(f,1,sizeof(f));
                       ^
/in/foo.cc:25:22: error: 'memset' was not declared in this scope
  memset(f,1,sizeof(f));
                      ^
/in/foo.cc:45:13: warning: left operand of comma operator has no effect [-Wunused-value]
     a[i][WE]==0,dist[i]--;
     ~~~~~~~~^~~