# ? by Happynewyear @ 2018-08-30 20:16:59
里面公式 ```cpp $ (1<=n<=10^{5}; 1<=m<=10^{5}) $ ``` $ (1<=n<=10^{5}; 1<=m<=10^{5}) $ by WA鸭鸭 @ 2018-08-30 20:26:12