为什么${\color{red}{\text{T}}}$了后三个点 $\dots$

$\text{题目链接}$

#include <bits/stdc++.h>
using namespace std;
#define int long long
const int w=1e5+5;
int f[w][18],q,n;
inline int read(){
	int x=0,f=1;char ch=getchar();
	while (ch<'0'||ch>'9'){if (ch=='-') f=-1;ch=getchar();}
	while (ch>='0'&&ch<='9'){x=x*10+ch-48;ch=getchar();}
	return x*f;
}
signed main(){
	cin.tie(0) -> ios::sync_with_stdio(0);
	n=read(),q=read();
	for(int i=1;i<=n;i++){
		f[i][0]=read();
	}
	for(int j=1;j<=19;j++){
		for(int i=1;i+(1<<j)-1<=n;i++){
			f[i][j]=max(f[i][j-1],f[i+(1<<(j-1))][j-1]);
		}
	}
	while(q--){
		int l,r;
		l=read(),r=read();
		int len=log2(r-l+1);
		cout<<max(f[l][len],f[r-(1<<len)+1][len])<<endl;
	}
	return 0;
}