table { border-width:2px; border-style:solid; border-color:#202300; border-collapse:collapse; } th,td { border-width:1px; border-style:solid; border-color:#202300; border-collapse:collapse; } 分类 数论问题 计算问题 计数 应用题 几何问题 行程问题 杂题 1 | | | | | | | | 2 | | | | | | | | 3 | | | | | | | | 4 | | | | | | | | 5 | | | | | | | | 6 | | | | | | | | 7 | | | | | | | | 8 | | | | | | | | 9 | | | | | | | | 10 | | | | | | | | 11 | | | | | | | | 12 | | | | | | | | 13 | | | | | | | | 14 | | | | | | | | 15 | | | | | | | | |