杭电5443 线段树模板

#include <iostream>
#include <cstdio>
using namespace std;
const int maxn=200001;
#define left l,m,rt<<1
#define right m+1,r,rt<<1|1
int Max[maxn<<2];
void UP(int rt)
{
    Max[rt]=max(Max[rt<<1],Max[rt<<1|1]);
}
void build(int l,int r,int rt)
{
    if(l==r)
    {
        scanf("%d",&Max[rt]);
		return;
    }
    int m=(l+r)>>1;
    build(left);
    build(right);
    UP(rt);
}
int query(int L,int R,int l,int r,int rt)
{
    if(L<=l&&R>=r)return Max[rt];
    int m=(r+l)>>1;
    int ret=0;
    if(L<=m)ret=max(ret,query(L,R,left));
    if(R>m)ret=max(ret,query(L,R,right));
    return ret;
}
int x[maxn];
int main()
{
    int N,M,i,j,sum,T,q,le,ri;
    char character;
    int a,b;
    scanf("%d",&T);
    while(T--)
    {
        scanf("%d",&N);
		sum=0;
        build(1,N,1);
        scanf("%d",&q);
        while(q--)
        {
        	scanf("%d%d",&le,&ri);
        int sum=query(le,ri,1,N,1);
        cout<<sum<<endl;
		}
    }
return 0;
}