题目里说了，要用分治算法
by c_h_y @ 2024-04-10 15:00:38
@[lty0604](/user/1243716) `cin>>a[i];`用`scanf("%d",&a[i]);`
by __zaa__ @ 2024-04-10 15:05:19
用 `nth_element` 函数，加上 `ios::sync_with_stdio(false);`
by WMWD @ 2024-04-10 22:26:27
@[__zaa__](/user/716965) 显而易见没什么鸟用
by elong123 @ 2024-04-11 21:09:07
@[__zaa__](/user/716965) 不止scanf输出也要改成更快的
by elong123 @ 2024-04-11 21:14:04
加一句ios::sync_with_stdio(0)
by BugManMax @ 2024-04-18 16:53:05
可以用快读快写，我一开始也是后两个TLE，加了快读快些就过了
by L_SenY @ 2024-04-18 22:23:12
@[L_SenY](/user/1290646) 是快读快写（
by L_SenY @ 2024-04-18 22:24:11