add test for subset exp

Author: hitonanode

set_power_series/test/subset_exp.test.cpp

@@ -0,0 +1,18 @@
+#define PROBLEM "https://judge.yosupo.jp/problem/exp_of_set_power_series"
+#include "../../modint.hpp"
+#include "../subset_convolution.hpp"
+#include <iostream>
+using namespace std;
+using mint = ModInt<998244353>;
+
+int main() {
+    cin.tie(nullptr);
+    ios::sync_with_stdio(false);
+
+    int N;
+    cin >> N;
+    vector<mint> f(1 << N);
+    for (auto &x : f) cin >> x;
+    subset_exp(f);
+    for (int i = 0; i < 1 << N; i++) cout << f.at(i) << " \n"[i + 1 == 1 << N];
+}