hdu4973A simple simulation problem. 线段树

//n(n<=5e4+10)个格子,每个格子的初始值为1
//m(m<=5e4+10)个询问
//D l r 将区间l,r的所有点翻倍
//D l r 问区间l,r中格子中最多的数
//线段树维护三个值，ss(区间的所有值之和),ma(区间中的最大值)
//mm(区间需要乘2的多少次方)
#include<cstdio>
#include<cstring>
#include<iostream>
using namespace std  ;
const int maxn = 5e4+10 ;
#define left v<<1
#define right v<<1|1
typedef long long ll ;
struct Tree
{
int l , r ;
int mm;
ll ss ;
ll ma ;
}tree[maxn<<2] ;
void push_up(int v)
{
tree[v].ma = max(tree[left].ma , tree[right].ma) ;
tree[v].ss = tree[left].ss + tree[right].ss ;
}
void push_down(int v)
{
if(tree[v].mm){
ll tmp = ((ll)1)<<tree[v].mm ;
tree[left].ss *= tmp ;
tree[left].ma *= tmp ;
tree[left].mm += tree[v].mm ;
tree[right].ss *= tmp ;
tree[right].ma *= tmp ;
tree[right].mm += tree[v].mm ;
tree[v].mm = 0 ;
}
}
void build(int l , int r , int v)
{
tree[v].l = l ;
tree[v].r = r;
tree[v].mm = 0 ;
if(l == r){
tree[v].ma = tree[v].ss = 1;
return ;
}
int mid = (l + r) >> 1 ;
build(l , mid , left) ;
build(mid+1,r,right) ;
push_up(v)  ;
}
void update(int l , int r , int v)
{
if(l <= tree[v].l && tree[v].r <= r){
tree[v].ss *= 2 ;
tree[v].ma *= 2 ;
tree[v].mm++;
return  ;
}
push_down(v) ;
int mid = (tree[v].l + tree[v].r) >> 1 ;
if(l <= mid)update(l,r,left) ;
if(r > mid)update(l,r,right) ;
push_up(v) ;
}
struct node
{
ll pp ,ss , xx ;
};
node query(ll x , int v)
{
if(tree[v].l == tree[v].r)
return node{tree[v].l , tree[v].ss , x} ;
push_down(v) ;
node ans ;
if(tree[left].ss >= x)
ans = query(x , left) ;
else ans = query(x-tree[left].ss , right) ;
push_up(v) ;
return ans ;
}
void add(int pos , ll x , int v)
{
if(tree[v].l == tree[v].r){
tree[v].ma += x ;
tree[v].ss += x ;
return ;
}
push_down(v) ;
int mid = (tree[v].l + tree[v].r) >> 1 ;
if(pos <= mid)add(pos , x , left) ;
else add(pos , x , right) ;
push_up(v) ;
}
ll get_ans(int l , int r , int v)
{
if(l <= tree[v].l && tree[v].r <= r)
return tree[v].ma ;
push_down(v) ;
int mid = (tree[v].l + tree[v].r) >> 1 ;
ll ans = 0 ;
if(l <= mid)ans = max(ans , get_ans(l,r,left)) ;
if(r > mid) ans = max(ans , get_ans(l,r,right)) ;
push_up(v) ;
return ans  ;
}
int main()
{
int t ;
int cas = 0 ;
scanf("%d" , &t) ;
while(t--)
{
int n , m ;
scanf("%d%d" , &n , &m) ;
build(1,n,1) ;
char ch[5] ;
ll l , r ;
printf("Case #%d:\n" , ++cas) ;
while(m--)
{
scanf("%s%lld%lld" , ch , &l , &r) ;
node p1 = query(l,1) ;
node p2 = query(r,1) ;
if(ch[0] == 'D'){
if(p1.pp == p2.pp)
add(p1.pp,r-l+1,1) ;
else{
add(p1.pp,p1.ss-p1.xx+1,1) ;
add(p2.pp,p2.xx,1) ;
update(p1.pp+1,p2.pp-1,1) ;
}
}
else {
if(p1.pp == p2.pp)
printf("%lld\n" , r-l+1) ;
else{
ll ans = max(p1.ss-p1.xx+1,p2.xx)  ;
ans  = max(ans , get_ans(p1.pp+1,p2.pp-1,1)) ;
printf("%lld\n" , ans) ;
}
}
}
}
return 0 ;
}