/in/foo.c: In function 'main':
/in/foo.c:7:27: warning: variable 'lenans' set but not used [-Wunused-but-set-variable]
     int n,k,qm,bj,lw,sums,lenans,ans1,anssum=0;
                           ^~~~~~
/in/foo.c:28:5: warning: 'ans1' may be used uninitialized in this function [-Wmaybe-uninitialized]
     printf("%d\n",ans1);
     ^~~~~~~~~~~~~~~~~~~