模板 倍增维护RMQ

倍增维护RMQ，nlogn预处理，O(1)查询

#include<bits/stdc++.h>
using namespace std;
const int maxn = 1e5+7;
struct RMQ{
    const static int RMQ_size = maxn;
    int n;
    int ArrayMax[RMQ_size][21];
    int ArrayMin[RMQ_size][21];
	int mm[RMQ_size];
    void build_rmq(){
        for(int j = 1 ; (1<<j) <= n ; ++ j)
            for(int i = 0 ; i + (1<<j) - 1 < n ; ++ i){
                ArrayMax[i][j]=max(ArrayMax[i][j-1],ArrayMax[i+(1<<(j-1))][j-1]);
                ArrayMin[i][j]=min(ArrayMin[i][j-1],ArrayMin[i+(1<<(j-1))][j-1]);
            }
	    mm[0]=-1;
	    for(int i=1;i<=n;i++){
	        mm[i]=((i&(i-1))==0)?mm[i-1]+1:mm[i-1];
	    }
    }

    int QueryMax(int l,int r){
	    int k = mm[r-l+1];
	    return max(ArrayMax[l][k],ArrayMax[r-(1<<k)+1][k]);
    }

    int QueryMin(int l,int r){
	    int k = mm[r-l+1];
	    return min(ArrayMin[l][k],ArrayMin[r-(1<<k)+1][k]);
    }


    void init(int * a,int sz){
        n = sz ;
        for(int i = 0 ; i < n ; ++ i) ArrayMax[i][0] = ArrayMin[i][0] = a[i];
        build_rmq();
    }

}solver;