rmq模板

#include<iostream>
#include<string.h>
#include<stdio.h>
using namespace std;
const int maxa = 50005;
int rmp_max[maxa][100];
int rmp_min[maxa][100];
int log(int n){
    int cnt = 0;
    while(n){
        cnt ++;
        n /= 2;
    }
    return cnt - 1;
}
int main(){
    int n, m;
    while(scanf("%d%d", &n ,&m)!=EOF){
        for(int i = 0;i < n; i++){
            scanf("%d", &rmp_max[i][0]);
            rmp_min[i][0] = rmp_max[i][0];
        }
        int l = log(n);
        for(int i = 1; i <= l; i++){
            for(int j = 0; j+(1<<(i-1)) < n; j++){
                rmp_max[j][i] = max(rmp_max[j][i-1], rmp_max[j+(1<<(i-1))][i-1]);
                rmp_min[j][i] = min(rmp_min[j][i-1], rmp_min[j+(1<<(i-1))][i-1]);
            }
        }
        while(m--){
            int a, b;
            scanf("%d%d", &a, &b);
            a--, b--;
            int j = log(b-a+1);
            int maxn = max(rmp_max[a][j], rmp_max[b-(1<<j)+1][j]);
            int minn = min(rmp_min[a][j], rmp_min[b-(1<<j)+1][j]);
            printf("%d ", maxn-minn);
        }
    }
}