diff --git a/src/problem/mod.rs b/src/problem/mod.rs
index 7fdc7f2..0b7cabf 100644
--- a/src/problem/mod.rs
+++ b/src/problem/mod.rs
@@ -228,4 +228,5 @@ mod p2708_maximum_strength_of_a_group;
 mod p2860_happy_students;
 mod p3174_clear_digits;
 mod p3176_find_the_maximum_length_of_a_good_subsequence_i;
-mod p3177_find_the_maximum_length_of_a_good_subsequence_ii;
\ No newline at end of file
+mod p3177_find_the_maximum_length_of_a_good_subsequence_ii;
+mod p977_squares_of_a_sorted_array;
\ No newline at end of file
diff --git a/src/problem/p977_squares_of_a_sorted_array.rs b/src/problem/p977_squares_of_a_sorted_array.rs
new file mode 100644
index 0000000..c294356
--- /dev/null
+++ b/src/problem/p977_squares_of_a_sorted_array.rs
@@ -0,0 +1,54 @@
+/**
+ * [977] Squares of a Sorted Array
+ */
+pub struct Solution {}
+
+
+// submission codes start here
+
+impl Solution {
+    pub fn sorted_squares(nums: Vec<i32>) -> Vec<i32> {
+        let mut stack = Vec::with_capacity(nums.len());
+        let mut result = Vec::with_capacity(nums.len());
+
+        for i in nums {
+            if i < 0 {
+                stack.push(i);
+                continue;
+            }
+
+            // 弹出当前栈中小于当前数字的数字
+            while let Some(&tail) = stack.last() {
+                let tail = -tail;
+                if tail > i {
+                    break;
+                }
+
+                result.push(tail.pow(2));
+                stack.pop();
+            }
+
+            result.push(i.pow(2));
+        }
+
+        while let Some(tail) = stack.pop() {
+            result.push(tail.pow(2));
+        }
+
+        result
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_977() {
+        assert_eq!(vec![0, 1, 9, 16, 100], Solution::sorted_squares(vec![-4, -1, 0, 3, 10]));
+        assert_eq!(vec![4, 9, 9, 49, 121], Solution::sorted_squares(vec![-7, -3, 2, 3, 11]));
+        assert_eq!(vec![1, 4], Solution::sorted_squares(vec![-2, -1]));
+    }
+}