diff --git a/crystal/crystal.cpp b/crystal/crystal.cpp
index 9270efa..934fc02 100644
--- a/crystal/crystal.cpp
+++ b/crystal/crystal.cpp
@@ -25,7 +25,7 @@ long long check(long long now, int tot) {
 }
 int main() {
     freopen("crystal.in", "r", stdin);
-    // freopen("crystal.out", "w", stdout);
+    freopen("crystal.out", "w", stdout);
     scanf("%d%lld", &n, &m);
     for(int i = 1; i <= n; ++i) scanf("%lld", &a[i]);
     sort(a + 1, a + n + 1);
diff --git a/crystal/gen.cpp b/crystal/gen.cpp
new file mode 100644
index 0000000..a4bdefa
--- /dev/null
+++ b/crystal/gen.cpp
@@ -0,0 +1,13 @@
+#include<bits/stdc++.h>
+using namespace std;
+mt19937_64 ran64(time(0));
+mt19937 ran(time(0));
+int main() {
+    int n = ran() % 5000;
+    long long m = ran64() % 1000000000000000000ll;
+    printf("%d %lld\n", n, m);
+    for(int i = 1; i <= n; ++i) {
+        printf("%lld ", ran64() % 1000000000000ll);
+    }
+    return 0;
+}
\ No newline at end of file