Optimize I/O in all test files: sync_with_stdio + cin.tie + endl→"\n"

[Copilot]

cin-based I/O in test files was unoptimized — C/C++ stream sync and cout flushing on every endl add unnecessary overhead.

Changes

• All 31 *.test.cpp files: Added at the top of main():

  ios_base::sync_with_stdio(false);
  cin.tie(NULL);

• All 31 *.test.cpp files: Replaced every endl with "\n" to avoid implicit flush on each output.

Before / After

// Before
int main() {
    int n;
    cin >> n;
    cout << n << endl;
}

// After
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n;
    cin >> n;
    cout << n << "\n";
}

Original prompt

テストコードでcinを使っているファイルがあるけど、入力がボトルネックになっているかもしれない。適切なコード変更を加えて。使うテクニックは

ios_base::sync_with_stdio(false);
cin.tie(NULL);
と、endlのかわりに、"\n"を使うやつ。

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