/in/foo.cc: In function 'int main()':
/in/foo.cc:7:12: warning: unused variable 'l' [-Wunused-variable]
     uint n,l,r,mid,len=1;scanf("%u",M);for(n=1;scanf(",%u",M+n)==1;n++);*Ans=M[n-1];
            ^
/in/foo.cc:7:14: warning: unused variable 'r' [-Wunused-variable]
     uint n,l,r,mid,len=1;scanf("%u",M);for(n=1;scanf(",%u",M+n)==1;n++);*Ans=M[n-1];
              ^
/in/foo.cc:7:16: warning: unused variable 'mid' [-Wunused-variable]
     uint n,l,r,mid,len=1;scanf("%u",M);for(n=1;scanf(",%u",M+n)==1;n++);*Ans=M[n-1];
                ^~~