diff --git a/src/problem/mod.rs b/src/problem/mod.rs
index 0c44635..359b4e1 100644
--- a/src/problem/mod.rs
+++ b/src/problem/mod.rs
@@ -97,4 +97,5 @@ mod p27_remove_element;
 mod p80_remove_duplicates_from_sorted_array_ii;
 mod p169_majority_element;
 mod p189_rotate_array;
-mod p121_best_time_to_buy_and_sell_stock;
\ No newline at end of file
+mod p121_best_time_to_buy_and_sell_stock;
+mod p274_h_index;
\ No newline at end of file
diff --git a/src/problem/p274_h_index.rs b/src/problem/p274_h_index.rs
new file mode 100644
index 0000000..5e5740b
--- /dev/null
+++ b/src/problem/p274_h_index.rs
@@ -0,0 +1,42 @@
+/**
+ * [274] H-Index
+ */
+pub struct Solution {}
+
+// submission codes start here
+
+impl Solution {
+    pub fn h_index(citations: Vec<i32>) -> i32 {
+        let mut h_array = vec![0; 1001];
+
+        for i in citations {
+            let i = i as usize;
+
+            h_array[i] += 1;
+        }
+
+        let mut count = 0;
+        for i in (0..=1000).rev() {
+            count += h_array[i];
+
+            if count >= i {
+                return i as i32;
+            }
+        }
+
+        0
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_274() {
+        assert_eq!(3, Solution::h_index(vec![3, 0, 6, 1, 5]));
+        assert_eq!(1, Solution::h_index(vec![1,3,1]));
+    }
+}