change extended euclid

1 files changed, 3 insertions, 3 deletions

diff --git a/math/shortModInv.cpp b/math/shortModInv.cpp
index 747eb7a..244bacf 100644
--- a/math/shortModInv.cpp
+++ b/math/shortModInv.cpp
@@ -1,3 +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
+ll multInv(ll x, ll m) { // x^{-1} mod m
+    return 1 < x ? m - inv(m % x, x) * m / x : 1;
+}