/in/foo.cc: In function 'int main()':
/in/foo.cc:96:30: warning: statement has no effect [-Wunused-value]
    v[fa[num[qx[i]][qy[i]-1]]]==0;
    ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/in/foo.cc:97:30: warning: statement has no effect [-Wunused-value]
    v[fa[num[qx[i]][qy[i]+1]]]==0;
    ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/in/foo.cc:98:30: warning: statement has no effect [-Wunused-value]
    v[fa[num[qx[i]-1][qy[i]]]]==0;
    ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/in/foo.cc:99:30: warning: statement has no effect [-Wunused-value]
    v[fa[num[qx[i]+1][qy[i]]]]==0;
    ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~