delete pics to save space

1.1082.cpp

@@ -0,0 +1,22 @@
+#include<cstdio>
+#include<algorithm>
+using namespace std;
+typedef long long LL;
+LL exgcd(LL a,LL b,LL &x,LL &y)
+{
+	if(b==0) { x=1; y=0; return a; }
+	LL d=exgcd(b,a%b,x,y);
+	LL z=x; x=y; y=z-(a/b)*y;
+	return d;
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	LL a,b,x,y;
+	scanf("%lld%lld",&a,&b);
+	exgcd(a,b,x,y);
+	printf("%lld\n",(x%b+b)%b);
+	return 0;
+}