P3773 [CTSC2017]吉夫特

https://www.luogu.com.cn/record/80299079

Luogu/P3773/P3773.cpp

@@ -0,0 +1,31 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 233333 + 5;
+const int mod = 1e9 + 7;
+
+int n, f[N], ans;
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> n;
+
+    for (int i = 1, x; i <= n; i++) {
+        cin >> x;
+
+        for (int j = x - 1 & x; j; j = j - 1 & x) {
+            f[j] = (f[j] + f[x] + 1) % mod;
+        }
+
+        ans = (ans + f[x]) % mod;
+    }
+
+    cout << ans << endl;
+
+    return 0;
+}