/in/foo.cc: In function 'void solve()':
/in/foo.cc:80:24: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
         printf("%d\n",r);  
                        ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:84:13: warning: unused variable 'k' [-Wunused-variable]
     int i,j,k;  
             ^