Neokaye @ 2024-11-26 21:06:10
#include<bits/stdc++.h>
using namespace std;
#define ll long long
const int N=1e6+5;
const ll INF=1e18;
ll a[N];
ll tree[N<<2];
ll add[N<<2],change[N<<2];
ll ls(ll p){return p<<1;}
ll rs(ll p){return p<<1|1;}
ll push_up(ll p){tree[p]=max(tree[ls(p)],tree[rs(p)]);}
void build(ll p,ll pl,ll pr){
add[p]=0;change[p]=INF;
if(pl==pr){tree[p]=a[pl];return ;}
ll mid=pl+pr>>1;
build(ls(p),pl,mid);
build(rs(p),mid+1,pr);
push_up(p);
}
void add_tag(ll p,ll d){
add[p]+=d;tree[p]+=d;
}
void change_tag(ll p,ll d){
change[p]=d;add[p]=0;tree[p]=d;
}
void push_down(ll p){
if(change[p]!=INF){
change_tag(ls(p),change[p]);
change_tag(rs(p),change[p]);
change[p]=INF;
}
if(add[p]){
add_tag(ls(p),add[p]);
add_tag(rs(p),add[p]);
add[p]=0;
}
}
void update1(ll p,ll pl,ll pr,ll L,ll R,ll d){
if(L<=pl&&pr<=R){change_tag(p,d);return ;}
//cout<<111<<'\n';
push_down(p);
ll mid=pl+pr>>1;
if(L<=mid) update1(ls(p),pl,mid,L,R,d);
if(R>mid) update1(rs(p),mid+1,pr,L,R,d);
push_up(p);
}
void update2(ll p,ll pl,ll pr,ll L,ll R,ll d){
if(L<=pl&&pr<=R){add_tag(p,d);return ;}
//cout<<111<<'\n';
push_down(p);
ll mid=pl+pr>>1;
if(L<=mid) update2(ls(p),pl,mid,L,R,d);
if(R>mid) update2(rs(p),mid+1,pr,L,R,d);
push_up(p);
}
ll query(ll p,ll pl,ll pr,ll L,ll R){
if(L<=pl&&pr<=R){return tree[p];}
//cout<<111<<'\n';
push_down(p);
ll mid=pl+pr>>1;
ll res=-INF;
if(L<=mid) res=max(res,query(ls(p),pl,mid,L,R));
if(R>mid) res=max(res,query(rs(p),mid+1,pr,L,R));
return res;
}
int main(){
ios::sync_with_stdio(false);
cin.tie(0);
int n,q;cin>>n>>q;
for(int i=1;i<=n;i++) cin>>a[i];
build(1,1,n);
while(q--){
ll opt,l,r,x;
cin>>opt>>l>>r;
if(opt==1){cin>>x;update1(1,1,n,l,r,x);}
else if(opt==2){cin>>x;update2(1,1,n,l,r,x);}
else {cout<<query(1,1,n,l,r)<<'\n';}
}
return 0;
}
by zzz13579zzz @ 2024-11-26 21:14:37
push_up没有返回值
by Neokaye @ 2024-11-27 12:51:48
@zzz13579zzz 谢谢,已关注