Rigorous peer-reviews are the basis of high-quality academic publishing. Due to the great efforts of our reviewers, C was able to maintain its standards for the high quality of its published papers. Thanks to the contribution of our reviewers, in 2021, the median time to first decision was 13 days, and the median time to publication was 37 days. The editors would like to extend their gratitude and recognition to the following reviewers for their precious time and dedication, regardless of whether the papers they reviewed were finally published:
| A. B. M. Zakaria | Lukasz Niedzwiecki |
| Abdelhafed Taleb | Mahdi Ghorbani-Asl |
| Agnieszka Medyńska-Juraszek | Marek Wiśniewski |
| Alberto Gambelli | Maria Letizia Terranova |
| Alessia Famengo | Maria Papastergiou |
| Alexander Vanetsev | Marta Kepinska |
| Ana Cazacu | Martin Friák |
| Ana Pilar Valerga Puerta | Mattia Bartoli |
| Andrew N. Rider | Meikang Han |
| Andrey Kistanov | Michael Burger |
| Anna Szymczak-Graczyk | Miguel A. Montes-Moran |
| Anthony Leggiero | Mirosław Kwiatkowski |
| Antonio J. Martinez-Martinez | Mohamed A. Habila |
| Antony R. Thiruppathi | Mohammad Peydayesh |
| Artur Camposo Pereira | Monika Wawrzkiewicz |
| Atichat Wongkoblap | Motilal Mathesh |
| Bernadette Teleky | Nectarios Vidakis |
| Bishweshwar Pant | Nicola Calisi |
| Bruno Marino | Nicoleta Nicole Radu |
| Carsten Ullrich | Noelia Bajales |
| Chang-Sik Ha | Paola Fini |
| Chao Gao | Paolo Bertoncello |
| Chaomin Zhang | Pascal Puech |
| David Cabaleiro | Petr Jakubec |
| David López-Díaz | Pietro Tagliatesta |
| Dawid Janas | Piotr A. Gauden |
| Dhanasekaran Vikraman | Piotr Kamedulski |
| Dirk Tuma | Rahul Kamath |
| Dongsheng Ji | Renata Tokarz-Sobieraj |
| Elena Korznikova | Roberto Pizzoferrato |
| Elisabete C.B.A. Alegria | Rong-Ho Lee |
| Elisabetta Fanizza | Roxana Jijie |
| Enrico Andreoli | Salvador Ordóñez |
| Eugene Kogan | Samuel Yeboah Mensah |
| Ewa Korzeniewska | Sanjeev Kumar |
| Filippo Fabbri | Sarunas Meskinis |
| Franco Cataldo | Seong Huh |
| Francois Normand | Seong-Ho Yoon |
| Gabriela Rosa | Shaheer Maher |
| Gheorghe Nechifor | Soubantika Palchoudhury |
| Grzegorz Maj | Stefano Cicchi |
| Gurjot S. Dhaliwal | Supriyo Ray |
| Gyula Tircso | Takafumi Kitazawa |
| Hehua Jin | Tiago A. Fernandes |
| Ilkeun Lee | Tomasz Szymborski |
| Ionela Nica | Venkata Puli |
| Jahir Orozco Holguín | Vera Realinho |
| Javier Martín-Sánchez | Vineet Kumar |
| Jiantong Li | Vitalii I. Sysoev |
| Jung Ho Kim | Wojciech Macek |
| Karol Szałowski | Xuejun Zhang |
| Katsuhiko Ariga | Xunjin Zhu |
| Kenan Song | Yexiang Tong |
| Lan Li | Yingtao Liu |
| Laura Bulgariu | Yong Tae Kim |
| Lok Shrestha | Zaoli Zhang |
| Luigi Stagi | Zhen-Yu Wu |
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