'commit'

LuoGu/RuMen/P1726.cpp

@@ -0,0 +1,19 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+
+int main() {
+    int n, i;
+    double f[50];
+    f[0] = 0;
+    f[1] = 1;
+    f[2] = 1;
+    cin >> n;
+
+    for (i = 3; i <= n; i++)
+        f[i] = f[i - 1] + f[i - 2];
+
+    printf("%0.2lf", f[n]);
+    return 0;
+}