877. 扩展欧几里得算法

https://www.acwing.com/problem/content/submission/code_detail/13592399/

AcWing/877/877.cpp

@@ -0,0 +1,32 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+int n, 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 >> n;
+
+    while (n--) {
+        cin >> a >> b;
+        exgcd(a, b, x, y);
+        cout << x << ' ' << y << endl;
+    }
+
+    return 0;
+}