Update README.md

ICPC-Caribbean · Jul 21, 2018 · dfdb2da · dfdb2da
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diff --git a/README.md b/README.md
@@ -100,3 +100,19 @@ int main(int argc, char* argv[])
     cout << rnd.next("[a-zA-Z0-9]{1,1000}") << endl;  /* Random word of length [1,1000]. */
 }
 ```
+
+This generator outputs random permutation, the size equals to the first command line argument.
+
+```c++
+#include "testlib.h"
+
+using namespace std;
+
+int main(int argc, char* argv[]) {
+    registerGen(argc, argv, 1);
+
+    int n = atoi(argv[1]);
+    println(n);
+    println(rnd.perm(n, 1));
+}
+```