/in/foo.cc: In function 'int shan(int)':
/in/foo.cc:16:17: warning: statement has no effect [-Wunused-value]
    b[a[x][i]][5]==1;
    ~~~~~~~~~~~~~^~~
/in/foo.cc:14:36: warning: array subscript is above array bounds [-Warray-bounds]
   if(b[a[x][i]][1]==2&&b[a[x][i]][5]==0)
                        ~~~~~~~~~~~~^