From bda3a10622770a15328a8679ce2b296b167c8c16 Mon Sep 17 00:00:00 2001
From: Baoshuo <i@baoshuo.ren>
Date: Wed, 20 Apr 2022 16:25:06 +0800
Subject: [PATCH] =?UTF-8?q?203.=20=E5=90=8C=E4=BD=99=E6=96=B9=E7=A8=8B?=
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https://www.acwing.com/problem/content/submission/code_detail/13560716/
---
 AcWing/203/203.cpp | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 AcWing/203/203.cpp

diff --git a/AcWing/203/203.cpp b/AcWing/203/203.cpp
new file mode 100644
index 00000000..6717c7e9
--- /dev/null
+++ b/AcWing/203/203.cpp
@@ -0,0 +1,32 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+int a, b, x, y;
+
+int exgcd(int a, int b, int &x, int &y) {
+    if (!b) {
+        x = 1;
+        y = 0;
+        return a;
+    }
+
+    int g = exgcd(b, a % b, y, x);
+    y -= a / b * x;
+
+    return g;
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+
+    cin >> a >> b;
+
+    exgcd(a, b, x, y);
+
+    cout << (x % b + b) % b << endl;
+
+    return 0;
+}