2024-12-25AtCoder Regular Contests\[\begin{matrix}\color{#d9d9d9}\blacksquare\color{#D9C5B2}\blacksquare\color{#B2D9B2}\blacksquare\color{#B2ECEC}\blacksquare\color{#B2B2FF}\blacksquare\color{#ECECB2}\blacksquare\color{#FFD9B2}\blacksquare\color{#FFB2B2}\blacksqu