Submission #984010

#	Time	Username	Problem	Language	Result	Execution time	Memory
984010		Nexus	Rainforest Jumps (APIO21_jumps)	C++17	33 / 100	4022 ms	27352 KiB

jumps

#include <bits/stdc++.h>
#define ll long long
#define mid (r+l)/2

using namespace std;

const ll N=2e5+9,M=2e18+9,mod=1e9+7;

bool vis[N];
pair<ll,ll>p;
vector<ll>v[N];
ll t[4*N],n,x,y,z;
queue<pair<ll,ll>>q;

void up(ll i,ll l,ll r,ll ind,ll v,bool ty)
{
    if(l==r)
    {
        t[i]=v;
        return;
    }
    if(ind<=mid)up(2*i,l,mid,ind,v,ty);
    else up(2*i+1,mid+1,r,ind,v,ty);
    if(ty)t[i]=max(t[2*i],t[2*i+1]);
    else t[i]=min(t[2*i],t[2*i+1]);
}

ll Q(ll i,ll l,ll r,ll s,ll e,bool ty)
{
    if(s<=l && r<=e)return t[i];
    if(s<=mid && mid<e)
    {
        if(ty)return max(Q(2*i,l,mid,s,e,ty),Q(2*i+1,mid+1,r,s,e,ty));
        else return min(Q(2*i,l,mid,s,e,ty),Q(2*i+1,mid+1,r,s,e,ty));
    }
    if(s<=mid)return Q(2*i,l,mid,s,e,ty);
    return Q(2*i+1,mid+1,r,s,e,ty);
}

void init(int n,vector<int>h)
{
    memset(t,0,sizeof t);
    for(ll i=0;i<n;++i)
    {
        up(1,0,n,h[i],i+1,1);

        x=(h[i]<n?Q(1,0,n,h[i]+1,n,1):0);

        if(x)v[x-1].push_back(i);
    }

    for(ll i=0;i<4*N;++i)t[i]=M;

    for(ll i=n-1;i>=0;--i)
    {
        up(1,0,n,h[i],i+1,0);

        x=(h[i]<n?Q(1,0,n,h[i]+1,n,0):M);

        if(x!=M)v[x-1].push_back(i);
    }
}

int minimum_jumps(int A, int B, int C, int D)
{
    x=-1;
    memset(vis,false,sizeof vis);
    for(ll i=C;i<=D;++i)
    for(auto j:v[i])q.push({j,1});
    while(q.size())
    {
       p=q.front();
       q.pop();
       if(vis[p.first])continue;
       vis[p.first]=1;
       if(A<=p.first && p.first<=B)
       x=(x==-1?p.second:min(x,p.second));
       ++p.second;
       for(auto j:v[p.first])q.push({j,p.second});
    }
    return x;
}

• Subtask 1: 0 / 4
• Subtask 2: 8 / 8
• Subtask 3: 13 / 13
• Subtask 4: 12 / 12
• Subtask 5: 0 / 23
• Subtask 6: 0 / 21
• Subtask 7: 0 / 19