'commit'

TangDou/AcWing/DP/GunDongShuZhu_Fib.cpp

@@ -0,0 +1,17 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int n;
+int f[3];
+int Fib() {
+    f[1] = 1, f[2] = 1;
+    for (int i = 3; i <= n; i++)
+        f[i % 3] = f[(i - 2) % 3] + f[(i - 1) % 3];
+    return f[n % 3];
+}
+
+int main() {
+    scanf("%d", &n);
+    printf("%d\n", Fib());
+    return 0;
+}