From e5676ef4ad6652ea794aac5d10ce8b65b20e9351 Mon Sep 17 00:00:00 2001
From: Lucas Schwebler <lucas.schwebler@gmail.com>
Date: Wed, 15 Nov 2023 17:19:47 +0100
Subject: add shortModInv and /usr/bin/time -v

---
 math/shortModInv.cpp | 3 +++
 1 file changed, 3 insertions(+)
 create mode 100644 math/shortModInv.cpp

(limited to 'math/shortModInv.cpp')

diff --git a/math/shortModInv.cpp b/math/shortModInv.cpp
new file mode 100644
index 0000000..747eb7a
--- /dev/null
+++ b/math/shortModInv.cpp
@@ -0,0 +1,3 @@
+ll inv(ll a, ll b){ // a^{-1} mod b
+    return 1 < a ? b - inv(b % a, a) * b / a : 1;
+}
\ No newline at end of file
-- 
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