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===== 惨痛教训 =====
记得看数据范围，从 ''MAXN'' 到 ''long long'' 都要注意，在提交前确认一遍后再提交。
边界情况一定要动笔写清各种定义，避免混乱导致的边界错误。
勇于打表。
在赛场上不能犯懒，有稳妥解法就不要铤而走险去省事儿。
尽量少看通过率极低的题目。
即使是 ''Python'' 也存在相当的浮点精度误差，在大整数进行诸如 ''sqrt'' 等操作时可能会出现大于 ''1'' 的误差，一定要进行修正，或直接采用二分进行实现。