Function slow

code/mathematics/fht.test.cpp:3–11

// Field testing: CSAcademy Random Nim Generator, CSAcademy And Closure

vi slow(vi a, vi b) {
    vi c(size(a));
    rep(i,0,size(a)) {
        rep(j,0,size(b)) {
            c[i^j] += a[i] * b[j];
        }
    }
    return c;
}

void test() {
    rep(it,0,1000) {