'commit'

TangDou/LuoGuBook/P2660.cpp

@@ -0,0 +1,19 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+typedef long long LL;
+LL x, y, ans;
+
+//辗转相除法
+LL gcd(LL a, LL b) {
+    if (b == 0) return a;
+    ans += 4 * b * (a / b);
+    return gcd(b, a % b);
+}
+
+int main() {
+    cin >> x >> y;
+    gcd(x, y);
+    printf("%lld\n", ans);
+    return 0;
+}