D1T3

Posted 2020-11-10 ace-myx

#include<bits/stdc++.h>
using namespace std;
const int N=500005;
struct node{
    int pos,val,id;
    bool operator <(const node &x)const{return x.pos>pos;}
};
struct data{int l,r,pos;}q[N];
int n,m,a[N],ans[N],x,vis[N],p[N],c[N],l,r;
double f[N],g[N];
std::vector<node> que;
inline int read()
{
    int x=0,f=1;char c=getchar();
    while(c<'0'||c>'9'){if(c=='-')f=-1;c=getchar();}
    while(c>='0'&&c<='9'){x=x*10+c-'0';c=getchar();}
    return x*f;
}
inline double cal(int u,int v)
{return a[u]+sqrt(abs(v-u))-a[v];}
inline int find(data b,int u)
{
    int ll=b.l,rr=b.r;
    while(ll<=rr)
    {
        int mid=(ll+rr)>>1;
        if(cal(b.pos,mid)>cal(u,mid))ll=mid+1;
        else rr=mid-1;
    }
    return ll;
}
inline void rev()
{for(int i=1;i<=n/2;i++)swap(a[i],a[n-i+1]);}
inline void solve(double *b)
{
    int head=1,tail=0;
    for(int i=1;i<=n;i++)
    {
        q[head].l++;
        if(head<=tail&&q[head].r<q[head].l)head++;
        if(head>tail||cal(i,n)>cal(q[tail].pos,n))
        {
            while(head<=tail&&cal(q[tail].pos,q[tail].l)<cal(i,q[tail].l))
                tail--;
            if(head>tail)q[++tail]=data{i,n,i};
            else
            {
                int ee=find(q[tail],i);
                q[tail].r=ee-1;
                q[++tail]=data{ee,n,i};
            }
        }
        b[i]=cal(q[head].pos,i);
    }
}
inline int lowbit(int now){return (now&(-now));}
inline void modify(int pos,int val)
{for(int i=pos;i<=n;i+=lowbit(i))c[i]+=val;}
inline int query(int pos)
{
    int gg=0;
    for(int i=pos;i>=1;i-=lowbit(i))gg+=c[i];
    return gg;
}
int main(int argc, char const *argv[])
{
    freopen("fight.in","r",stdin);
    freopen("fight.out","w",stdout);
    n=read();m=read();
    for(int i=1;i<=n;i++)a[i]=read();
    solve(f);rev();solve(g);
    for(int i=1;i<=n;i++)p[i]=max(0,(int)ceil(max(f[i],g[n-i+1])));
    for(int i=1;i<=m;i++)
    {
        x=read();l=read();r=read();
        que.push_back(node{l-1,p[x]/2,i});
        que.push_back(node{r,p[x]/2,i});
    }
    sort(que.begin(),que.end());
    int cur=1;
    for(int i=0;i<que.size();i++)
    {
        if(i)for(int j=que[i-1].pos+1;j<=que[i].pos;j++)
        modify(p[j],1);
        else for(int j=1;j<=que[i].pos;j++)modify(p[j],1);
        if(!vis[que[i].id])
        {ans[que[i].id]-=query(que[i].val);vis[que[i].id]=true;}
        else ans[que[i].id]+=query(que[i].val);
    }
    for(int i=1;i<=m;i++)printf("%d\n",ans[i]);
    return 0;
}