/in/foo.c: In function 'dfs':
/in/foo.c:50:15: warning: 'q' may be used uninitialized in this function [-Wmaybe-uninitialized]
             if(q-1>=0){
               ^
/in/foo.c:61:33: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
             temp[p][q+1]=temp[p][q];
                          ~~~~~~~^~~