线段树，最大值查询位子(个人模版)

线段树，最大值查询位子：

#include<cstdio>
#include<climits>
#include<algorithm>

using namespace std;

#define lson l, m, rt<<1
#define rson m+1, r, (rt<<1)|1

int tree[111111<<2];
int posn[111111<<2];
void pushup(int rt)
{
    if (tree[rt<<1] > tree[rt<<1|1])
    {
        tree[rt] = tree[rt<<1];
        posn[rt] = posn[rt<<1];
    }
    else
    {
        tree[rt] = tree[rt<<1|1];
        posn[rt] = posn[rt<<1|1];
    }
}
void build(int l, int r, int rt)
{
    if (l == r)
    {
        scanf("%d", &tree[rt]);
        posn[rt] = l;
    }
    else
    {
        int m = (l + r) >> 1;
        build(lson);
        build(rson);
        pushup(rt);
    }
}
void update(int p, int val, int l, int r, int rt)
{
    if (l == r)
    {
        tree[rt] = val;
    }
    else
    {
        int m = (l + r) >> 1;
        if (p <= m)
        {
            update(p, val, lson);
        }
        else
        {
            update(p, val, rson);
        }
        pushup(rt);
    }
}
int query(int L, int R, int l, int r, int rt, int *pos)
{
    if (L <= l && r <= R)
    {
        *pos = posn[rt];
        return tree[rt];
    }
    else
    {
        int m = (l + r) >> 1;
        int ret1 = INT_MIN;
        int ret2 = INT_MIN;
        int pa, pb;
        int *pos1 = &pa;
        int *pos2 = &pb;
        if (L <= m)
        {
            ret1 = query(L, R,  lson, pos1);
        }
        if (R > m)
        {
            ret2 = query(L, R, rson, pos2);
        }
        if (ret1 > ret2)
        {
            *pos = pa;
        }
        else
        {
            *pos = pb;
            ret1 = ret2;
        }
        return ret1;
    }
}
int main(void)
{
    int n, m;

    while (scanf("%d", &n) != EOF)
    {
        build(1, n, 1);

        scanf("%d", &m);
        char op[2];
        int a, b;
        while (m--)
        {
            scanf("%s", op);
            if (op[0] == 'Q')
            {
                int pos;
                printf("%d %d
", pos, query(1, n, 1, n, 1, &pos));
            }
            else
            {
                scanf("%d%d", &a, &b);
                update(a, b, 1, n, 1);
            }
        }
        printf("
");
    }

    return 0;
}