codevs 4927 线段树练习5

赶在期末考试之前把这道傻逼题调了出来。

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
#define maxn 100500
using namespace std;
long long n,m,a[maxn];
long long root,tot=0,ls[maxn<<2],rs[maxn<<2];
long long lazy[maxn<<2],add[maxn<<2],sum[maxn<<2],mi[maxn<<2],mx[maxn<<2];
long long x,y,z;
bool vis[maxn<<2];
void pushup(long long now)
{
    sum[now]=sum[ls[now]]+sum[rs[now]];
    mx[now]=max(mx[ls[now]],mx[rs[now]]);
    mi[now]=min(mi[ls[now]],mi[rs[now]]);
}
void build(long long &now,long long left,long long right)
{
    now=++tot;lazy[now]=0;add[now]=0;
    if (left==right)
    {
        sum[now]=mx[now]=mi[now]=a[left];
        return;
    }
    long long mid=(left+right)>>1;
    build(ls[now],left,mid);
    build(rs[now],mid+1,right);
    pushup(now);
}
void pushdown(long long now,long long left,long long right)
{
    long long mid=(left+right)>>1;
    if (vis[now]==true)
    {
        lazy[ls[now]]=lazy[rs[now]]=mx[ls[now]]=mx[rs[now]]=mi[ls[now]]=mi[rs[now]]=lazy[now];
        sum[ls[now]]=(mid-left+1)*lazy[now];
        sum[rs[now]]=(right-mid)*lazy[now];
        lazy[now]=0;vis[now]=false;vis[ls[now]]=vis[rs[now]]=true;
        add[ls[now]]=0;add[rs[now]]=0;
    }
    if (add[now]!=0)
    {
        add[ls[now]]+=add[now];add[rs[now]]+=add[now];
        sum[ls[now]]+=(mid-left+1)*add[now];
        sum[rs[now]]+=(right-mid)*add[now];
        mx[ls[now]]+=add[now];mx[rs[now]]+=add[now];
        mi[ls[now]]+=add[now];mi[rs[now]]+=add[now];
        add[now]=0;
    }
}
void modify(long long now,long long left,long long right,long long l,long long r,long long p,long long type)
{
    pushdown(now,left,right);
    if ((left==l) && (right==r))
    {
        if (type==1)
        {
            add[now]+=p;sum[now]+=(right-left+1)*p;mx[now]+=p;mi[now]+=p;
            return;
        }
        else
        {
            lazy[now]=p;add[now]=0;sum[now]=p*(right-left+1);
            mx[now]=mi[now]=p;vis[now]=true;
            return;
        }
    }
    long long mid=(left+right)>>1;
    if (r<=mid) modify(ls[now],left,mid,l,r,p,type);
    else if (l>=mid+1) modify(rs[now],mid+1,right,l,r,p,type);
    else
    {
        modify(ls[now],left,mid,l,mid,p,type);
        modify(rs[now],mid+1,right,mid+1,r,p,type);
    }
    pushup(now);
}
long long ask(long long now,long long left,long long right,long long l,long long r,long long type)
{
    pushdown(now,left,right);
    if ((left==l) && (right==r))
    {
        if (type==1) return sum[now];
        else if (type==2) return mx[now];
        else return mi[now];
    }
    long long mid=(left+right)>>1;
    if (r<=mid) return ask(ls[now],left,mid,l,r,type);
    else if (l>=mid+1) return ask(rs[now],mid+1,right,l,r,type);
    else
    {
        if (type==1)
        {
            long long regis1=ask(ls[now],left,mid,l,mid,type);
            long long regis2=ask(rs[now],mid+1,right,mid+1,r,type);
            return regis1+regis2;
        }
        else if (type==2) return max(ask(ls[now],left,mid,l,mid,type),ask(rs[now],mid+1,right,mid+1,r,type));
        else return min(ask(ls[now],left,mid,l,mid,type),ask(rs[now],mid+1,right,mid+1,r,type));
    }
}
int main()
{
    memset(vis,false,sizeof(vis));
    scanf("%lld%lld",&n,&m);
    for (long long i=1;i<=n;i++)
        scanf("%lld",&a[i]);
    build(root,1,n);
    for (long long i=1;i<=m;i++)
    {
        char type[10];
        scanf("%s",type);
        if (type[0]==‘a‘)
        {
            scanf("%lld%lld%lld",&x,&y,&z);
            modify(root,1,n,x,y,z,1);
        }
        else if ((type[0]==‘s‘) && (type[1]==‘e‘))
        {
            scanf("%lld%lld%lld",&x,&y,&z);
            modify(root,1,n,x,y,z,2);
        }
        else if ((type[0]==‘s‘) && (type[1]==‘u‘))
        {
            scanf("%lld%lld",&x,&y);
            printf("%lld\n",ask(root,1,n,x,y,1));
        }
        else if ((type[0]==‘m‘) && (type[1]==‘a‘))
        {
            scanf("%lld%lld",&x,&y);
            printf("%lld\n",ask(root,1,n,x,y,2));
        }
        else
        {
            scanf("%lld%lld",&x,&y);
            printf("%lld\n",ask(root,1,n,x,y,3));
        }
    }
    return 0;
}