diff --git a/array/3_front_end_pointer_977/Cargo.lock b/array/3_front_end_pointer_977/Cargo.lock
new file mode 100644
index 0000000..355cee9
--- /dev/null
+++ b/array/3_front_end_pointer_977/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "front_end_pointer_977"
+version = "0.1.0"
diff --git a/array/3_front_end_pointer_977/Cargo.toml b/array/3_front_end_pointer_977/Cargo.toml
new file mode 100644
index 0000000..c8c1e49
--- /dev/null
+++ b/array/3_front_end_pointer_977/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "front_end_pointer_977"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
diff --git a/array/3_front_end_pointer_977/src/main.rs b/array/3_front_end_pointer_977/src/main.rs
new file mode 100644
index 0000000..4d224ee
--- /dev/null
+++ b/array/3_front_end_pointer_977/src/main.rs
@@ -0,0 +1,41 @@
+// 解題影片 https://www.youtube.com/watch?v=9u1qXgHMb7Q&list=PL-qDGN2q6cbClYCRpJ2pyrlhYK9VjZmL3&index=3
+// leetcode https://leetcode.com/problems/squares-of-a-sorted-array/
+fn main() {
+    let case_a: Vec<i32> = vec![-4,-1,0,3,10];
+    let result = sorted_squares(case_a);
+    println!("Result: {:?}", result);
+}
+
+// Input: nums = []
+// Output: [0,1,9,16,100]
+// Explanation: After squaring, the array becomes [16,1,0,9,100].
+// After sorting, it becomes [0,1,9,16,100].
+
+// 前後雙指針法
+pub fn sorted_squares(nums: Vec<i32>) -> Vec<i32> {
+    let mut left: usize = 0;
+    let mut right: usize = nums.len() - 1; // 陣列最後一個元素為長度 -1 因為起始為 0
+    let mut result: Vec<i32> = vec![0; nums.len()]; // 初始化結果向量
+    let mut new_pointer: isize = nums.len() as isize - 1; // 使用 isize 避免負索引
+
+    // 想停止條件，平方後的都做完了
+    while new_pointer >= 0 {
+        // 都是拿到比較大的，故從否面先塞
+        // 相等的話移動誰沒差，就移動前指針
+        if get_double(nums[left])>= get_double(nums[right]){
+            result[new_pointer as usize] = get_double(nums[left]);
+            new_pointer -= 1;
+            left += 1;
+        } else {
+            result[new_pointer as usize] = get_double(nums[right]);
+            new_pointer -= 1;
+            right -= 1;
+        }
+    }
+
+    return result;
+}
+
+fn get_double(val: i32)->i32{
+    val * val
+}
diff --git a/array/3_front_end_pointer_977/target/.rustc_info.json b/array/3_front_end_pointer_977/target/.rustc_info.json
new file mode 100644
index 0000000..2471d99
--- /dev/null
+++ b/array/3_front_end_pointer_977/target/.rustc_info.json
@@ -0,0 +1 @@
+{"rustc_fingerprint":13714326583451104423,"outputs":{"4614504638168534921":{"success":true,"status":"","code":0,"stdout":"rustc 1.78.0 (9b00956e5 2024-04-29)\nbinary: rustc\ncommit-hash: 9b00956e56009bab2aa15d7bff10916599e3d6d6\ncommit-date: 2024-04-29\nhost: aarch64-apple-darwin\nrelease: 1.78.0\nLLVM version: 18.1.2\n","stderr":""},"15729799797837862367":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.dylib\nlib___.dylib\nlib___.a\nlib___.dylib\n/Users/daniel/.rustup/toolchains/stable-aarch64-apple-darwin\noff\npacked\nunpacked\n___\ndebug_assertions\npanic=\"unwind\"\nproc_macro\ntarget_abi=\"\"\ntarget_arch=\"aarch64\"\ntarget_endian=\"little\"\ntarget_env=\"\"\ntarget_family=\"unix\"\ntarget_feature=\"aes\"\ntarget_feature=\"crc\"\ntarget_feature=\"dit\"\ntarget_feature=\"dotprod\"\ntarget_feature=\"dpb\"\ntarget_feature=\"dpb2\"\ntarget_feature=\"fcma\"\ntarget_feature=\"fhm\"\ntarget_feature=\"flagm\"\ntarget_feature=\"fp16\"\ntarget_feature=\"frintts\"\ntarget_feature=\"jsconv\"\ntarget_feature=\"lor\"\ntarget_feature=\"lse\"\ntarget_feature=\"neon\"\ntarget_feature=\"paca\"\ntarget_feature=\"pacg\"\ntarget_feature=\"pan\"\ntarget_feature=\"pmuv3\"\ntarget_feature=\"ras\"\ntarget_feature=\"rcpc\"\ntarget_feature=\"rcpc2\"\ntarget_feature=\"rdm\"\ntarget_feature=\"sb\"\ntarget_feature=\"sha2\"\ntarget_feature=\"sha3\"\ntarget_feature=\"ssbs\"\ntarget_feature=\"vh\"\ntarget_has_atomic=\"128\"\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_os=\"macos\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"apple\"\nunix\n","stderr":""}},"successes":{}}
\ No newline at end of file
diff --git a/array/3_front_end_pointer_977/target/CACHEDIR.TAG b/array/3_front_end_pointer_977/target/CACHEDIR.TAG
new file mode 100644
index 0000000..20d7c31
--- /dev/null
+++ b/array/3_front_end_pointer_977/target/CACHEDIR.TAG
@@ -0,0 +1,3 @@
+Signature: 8a477f597d28d172789f06886806bc55
+# This file is a cache directory tag created by cargo.
+# For information about cache directory tags see https://bford.info/cachedir/
diff --git a/array/3_front_end_pointer_977/target/debug/.cargo-lock b/array/3_front_end_pointer_977/target/debug/.cargo-lock
new file mode 100644
index 0000000..e69de29
diff --git a/array/3_front_end_pointer_977/target/debug/.fingerprint/front_end_pointer_977-f81ca00cf77d8b92/bin-front_end_pointer_977 b/array/3_front_end_pointer_977/target/debug/.fingerprint/front_end_pointer_977-f81ca00cf77d8b92/bin-front_end_pointer_977
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index 0000000..1c08904
--- /dev/null
+++ b/array/3_front_end_pointer_977/target/debug/.fingerprint/front_end_pointer_977-f81ca00cf77d8b92/bin-front_end_pointer_977
@@ -0,0 +1 @@
+8c776d0a5cbcc935
\ No newline at end of file
diff --git a/array/3_front_end_pointer_977/target/debug/.fingerprint/front_end_pointer_977-f81ca00cf77d8b92/bin-front_end_pointer_977.json b/array/3_front_end_pointer_977/target/debug/.fingerprint/front_end_pointer_977-f81ca00cf77d8b92/bin-front_end_pointer_977.json
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--- /dev/null
+++ b/array/3_front_end_pointer_977/target/debug/.fingerprint/front_end_pointer_977-f81ca00cf77d8b92/bin-front_end_pointer_977.json
@@ -0,0 +1 @@
+{"rustc":792111255936306319,"features":"[]","declared_features":"","target":2898340925340505798,"profile":14453530908159220714,"path":1684066648322511884,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/front_end_pointer_977-f81ca00cf77d8b92/dep-bin-front_end_pointer_977"}}],"rustflags":[],"metadata":7797948686568424061,"config":2202906307356721367,"compile_kind":0}
\ No newline at end of file
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diff --git a/array/3_front_end_pointer_977/target/debug/.fingerprint/front_end_pointer_977-f81ca00cf77d8b92/invoked.timestamp b/array/3_front_end_pointer_977/target/debug/.fingerprint/front_end_pointer_977-f81ca00cf77d8b92/invoked.timestamp
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+++ b/array/3_front_end_pointer_977/target/debug/.fingerprint/front_end_pointer_977-f81ca00cf77d8b92/invoked.timestamp
@@ -0,0 +1 @@
+This file has an mtime of when this was started.
\ No newline at end of file
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