JAVA AC代码(st表模板最大值)：

//最小值的话只需要把Math.max改为Math.min就行了
import java.util.*;
import java.util.StringTokenizer;
import java.io.*;

public class Main {
	
	public static void main(String[] args) {
		int n=in.nextInt();int m=in.nextInt();
		int len=(int) (Math.log((double)n)/Math.log(2));
		int[][] a=new int[len+1][n+1];
		for(int i=1;i<=n;i++) a[0][i]=in.nextInt();
		//st表的初始化
		for(int i=1;i<=len;i++) {
			for(int j=1;j<=n+1-(1<<i);j++) {
				a[i][j]=Math.max(a[i-1][j], a[i-1][j+(1<<(i-1))]);
			}
		}
		
		while(m-->0) {
			int l=in.nextInt();int r=in.nextInt();
			int k=(int) (Math.log((double)(r-l+1))/Math.log(2));
			int ans=Math.max(a[k][l], a[k][r+1-(1<<k)]);
			out.println(ans);
		}
		out.close();
	}
	



	static FastReader in=new FastReader();
	static PrintWriter out=new PrintWriter(System.out);
	static class FastReader{
		static BufferedReader br;
		static StringTokenizer st;
		FastReader(){
			br=new BufferedReader(new InputStreamReader(System.in));
		}
		String next() {
			String str="";
			while(st==null||!st.hasMoreElements()) {
				try {
					str=br.readLine();
				}catch(IOException e) {
					throw new RuntimeException(e);
				}
				st=new StringTokenizer(str);
			}
			return st.nextToken();
		}
		int nextInt() {
			return Integer.parseInt(next());
		}
		double nextDouble() {
			return Double.parseDouble(next());
		}
		long nextLong() {
			return Long.parseLong(next());
		}
	}
	
}