/in/foo.cc: In function 'int main()':
/in/foo.cc:34:37: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
             for (int k = 0; (k << i - 1) <= j && k <= num; k += 2) {
                                   ~~^~~
/in/foo.cc:35:53: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
                 f[i][j] += 1LL * f[i-1][j - (k << i - 1)] * C(num, k) % mod;
                                                   ~~^~~
/in/foo.cc:44:23: warning: format '%lld' expects argument of type 'long long int', but argument 2 has type 'int' [-Wformat=]
     printf("%lld", ans);
                       ^