Create ext_gcd.cpp

Author: manitajay

Templates/ext_gcd.cpp

@@ -0,0 +1,14 @@
+
+ll ext_gcd(ll a, ll b, ll& x, ll& y) 
+{
+ if (b == 0) {
+ x = 1;
+ y = 0;
+ return a;
+ }
+ ll x1, y1;
+ ll d = gcd(b, a % b, x1, y1);
+ x = y1;
+ y = x1 - y1 * (a / b);
+ return d;
+}