diff --git a/S2OJ/1686/1686.cpp b/S2OJ/1686/1686.cpp
new file mode 100644
index 00000000..e585321d
--- /dev/null
+++ b/S2OJ/1686/1686.cpp
@@ -0,0 +1,45 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 1e5 + 5,
+          M = (1 << 8) + 5;
+const int mod = 998244353;
+
+int n, a[N], f[N], sum[M][M];
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> n;
+
+    for (int i = 1; i <= n; i++) {
+        cin >> a[i];
+    }
+
+    for (int i = 1; i <= n; i++) {
+        f[i] = 1;
+
+        int s = a[i] >> 8,
+            t = a[i] & ((1 << 8) - 1);
+
+        for (int c = t;; c = (c - 1) & t) {
+            f[i] = (f[i] + sum[s][c]) % mod;
+            if (!c) break;
+        }
+
+        for (int c = s ^ ((1 << 8) - 1);; c = (c - 1) & (s ^ ((1 << 8) - 1))) {
+            sum[s | c][t] = (sum[s | c][t] + f[i]) % mod;
+            if (!c) break;
+        }
+    }
+
+    for (int i = 1; i <= n; i++) {
+        cout << f[i] << endl;
+    }
+
+    return 0;
+}
diff --git a/S2OJ/1686/data/count1.ans b/S2OJ/1686/data/count1.ans
new file mode 100644
index 00000000..ca288242
--- /dev/null
+++ b/S2OJ/1686/data/count1.ans
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
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+size 8785
diff --git a/S2OJ/1686/data/count1.in b/S2OJ/1686/data/count1.in
new file mode 100644
index 00000000..fa9985df
--- /dev/null
+++ b/S2OJ/1686/data/count1.in
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diff --git a/S2OJ/1686/data/count10.ans b/S2OJ/1686/data/count10.ans
new file mode 100644
index 00000000..66f25cf6
--- /dev/null
+++ b/S2OJ/1686/data/count10.ans
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diff --git a/S2OJ/1686/data/count10.in b/S2OJ/1686/data/count10.in
new file mode 100644
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--- /dev/null
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diff --git a/S2OJ/1686/data/count2.ans b/S2OJ/1686/data/count2.ans
new file mode 100644
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--- /dev/null
+++ b/S2OJ/1686/data/count2.ans
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diff --git a/S2OJ/1686/data/count2.in b/S2OJ/1686/data/count2.in
new file mode 100644
index 00000000..fb6cb36e
--- /dev/null
+++ b/S2OJ/1686/data/count2.in
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new file mode 100644
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new file mode 100644
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+++ b/S2OJ/1686/data/count3.in
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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