diff --git a/1684_count_the_number_of_consistent_strings/Cargo.lock b/1684_count_the_number_of_consistent_strings/Cargo.lock
new file mode 100644
index 0000000..b0bf651
--- /dev/null
+++ b/1684_count_the_number_of_consistent_strings/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "count_the_number_of_consistent_strings"
+version = "0.1.0"
diff --git a/1684_count_the_number_of_consistent_strings/Cargo.toml b/1684_count_the_number_of_consistent_strings/Cargo.toml
new file mode 100644
index 0000000..2fcb246
--- /dev/null
+++ b/1684_count_the_number_of_consistent_strings/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "count_the_number_of_consistent_strings"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/1684_count_the_number_of_consistent_strings/src/lib.rs b/1684_count_the_number_of_consistent_strings/src/lib.rs
new file mode 100644
index 0000000..4dd4a13
--- /dev/null
+++ b/1684_count_the_number_of_consistent_strings/src/lib.rs
@@ -0,0 +1,24 @@
+pub struct Solution;
+
+impl Solution {
+    pub fn count_consistent_strings(allowed: String, words: Vec<String>) -> i32 {
+        let mut allowed_table = 0u32;
+        for c in allowed.chars() {
+            allowed_table |= 1 << c as u32 - 97;
+        }
+
+        let mut result = 0;
+        for word in words {
+            let mut is_subset = 1;
+            for c in word.chars() {
+                if allowed_table & 1 << c as u32 - 97 == 0 {
+                    is_subset = 0;
+                    break;
+                }
+            }
+            result += is_subset;
+        }
+
+        result
+    }
+}