/in/foo.cc: In function 'int Mul(int*, int, int*, int, int*)':
/in/foo.cc:29:20: warning: unused variable 'cnt' [-Wunused-variable]
     int carry = 0, cnt = 0, i,temp;
                    ^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:47:25: warning: unused variable 'n' [-Wunused-variable]
     int x1, x2, n1, n2, n;
                         ^