diff --git a/.changes/judge-line.md b/.changes/judge-line.md
new file mode 100644
index 0000000..e7244b5
--- /dev/null
+++ b/.changes/judge-line.md
@@ -0,0 +1,5 @@
+---
+"eval-stack": patch:feat
+---
+
+Judge outputs for each line of expected outputs.
diff --git a/.cspell.json b/.cspell.json
index f1b1b89..b3a38f6 100644
--- a/.cspell.json
+++ b/.cspell.json
@@ -14,6 +14,7 @@
         "rlimit",
         "rustc",
         "rustup",
+        "serde",
         "setrlimit",
         "SIGBUS",
         "SIGILL",
@@ -21,5 +22,8 @@
         "statm",
         "sysconf",
         "unistd"
+    ],
+    "ignorePaths": [
+        "Cargo.lock"
     ]
 }
diff --git a/src/judge.rs b/src/judge.rs
index b26907b..ae06d09 100644
--- a/src/judge.rs
+++ b/src/judge.rs
@@ -1,5 +1,10 @@
 use std::{
-    fs, future::Future, io::Read, os::unix::process::ExitStatusExt, path::PathBuf, task::Poll,
+    fs,
+    future::Future,
+    io::{BufRead, BufReader},
+    os::unix::process::ExitStatusExt,
+    path::PathBuf,
+    task::Poll,
     time::Duration,
 };
 
@@ -51,18 +56,34 @@ impl Future for Judge {
                 drop(self.child.stdin.take());
                 drop(self.child.stdout.take());
                 if status.success() {
-                    let mut stdout = fs::File::open(&self.stdout_file)?;
-                    let mut expected_out = fs::File::open(&self.expected_output_file)?;
+                    let stdout = BufReader::new(fs::File::open(&self.stdout_file)?);
+                    let expected_out = BufReader::new(fs::File::open(&self.expected_output_file)?);
 
-                    let mut output = String::new();
-                    let mut expected_output = String::new();
-                    stdout.read_to_string(&mut output)?;
-                    expected_out.read_to_string(&mut expected_output)?;
-
-                    if output.trim_end_matches(|c: char| c.is_whitespace() || c == '\n')
-                        == expected_output
-                            .trim_end_matches(|c: char| c.is_whitespace() || c == '\n')
+                    let mut stdout_lines = stdout.lines();
+                    let mut expected_out_lines = expected_out.lines();
+                    let mut matched = true;
+                    while let (Some(output), Some(expected_output)) =
+                        (stdout_lines.next(), expected_out_lines.next())
                     {
+                        if output?.trim_end_matches(|c: char| c.is_whitespace() || c == '\n')
+                            != expected_output?
+                                .trim_end_matches(|c: char| c.is_whitespace() || c == '\n')
+                        {
+                            matched = false;
+                            break;
+                        }
+                    }
+
+                    while let Some(extra_line) = stdout_lines.next() {
+                        if extra_line?.trim_end_matches(|c: char| c.is_whitespace() || c == '\n')
+                            != ""
+                        {
+                            matched = false;
+                            break;
+                        }
+                    }
+
+                    if matched {
                         Poll::Ready(Ok(JudgeResult {
                             status: JudgeStatus::Accepted,
                             time_used: self.time_used,
diff --git a/tests/test.cpp b/tests/test.cpp
index 23d286a..d8e34e9 100644
--- a/tests/test.cpp
+++ b/tests/test.cpp
@@ -8,6 +8,6 @@ int main()
 {
     i64 a, b;
     cin >> a >> b;
-    cout << a + b << endl;
+    cout << a + b << endl << endl << endl;
     return 0;
 }