Submission #557376

#	Time	Username	Problem	Language	Result	Execution time	Memory
557376		WKYH	Rainforest Jumps (APIO21_jumps)	C++14	0 / 100	4016 ms	1048576 KiB

jumps

#include<bits/stdc++.h>
#define qc ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define rt return
#define fi first
#define se second
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
typedef long long int ll;
typedef long double ld;
const long long mod=1e9+7;
const long long inf=1e9+7;
using namespace std;
ll gcd(ll a,ll b){if(b==0)rt a;rt gcd(b,a%b);}

int n;
vector<vector<int>>gph,rch,pfx;
void init(int N,vector<int>h)
{
    n=N;
    gph.resize(n);
    for(int i=0;i<n;i++){
        for(int j=i-1;j>=0;j--){
            if(h[j]>h[i]){
                gph[i].push_back(j);
                break;
            }
        }
        for(int j=i+1;j<n;j++){
            if(h[j]>h[i]){
                gph[i].push_back(j);
                break;
            }
        }
    }
    rch.resize(n,vector<int>(n,inf));
    for(int i=0;i<n;i++){
        queue<pair<int,int>>q;q.push({0,i});
        while(!q.empty()){
            pair<int,int> f=q.front();
            q.pop();
            rch[i][f.second]=min(f.first,rch[i][f.second]);
            for(auto c:gph[f.second]){
                q.push({f.first+1,c});
            }
        }
    }
    pfx.resize(n,vector<int>(n+1));
    for(int i=0;i<n;i++){
        pfx[i][0]=0;
        for(int j=0;j<n;j++){
            if(j<=i)pfx[i][j+1]=0;
            else{
                if(rch[i][j]==inf)pfx[i][j+1]=pfx[i][j];
                else pfx[i][j+1]=pfx[i][j]+1;
            }
        }
    }
    rt;
}
int pcs(int i,int c,int d)
{
    if(c==d)rt rch[i][c];
    int mid=(c+d)/2;
    if(pfx[i][mid+1]==pfx[i][c])rt pcs(i,mid+1,d);
    else rt pcs(i,c,mid);
}
int minimum_jumps(int a,int b,int c,int d)
{
    int ans=inf;
    for(int i=a;i<=b;i++){
        if(pfx[i][d+1]-pfx[i][c]==0)continue;
        int num=pcs(i,c,d);
        ans=min(ans,num);
    }
    if(ans==inf)rt -1;
    rt ans;
}
/*
int main()
{
    init(7, {3, 2, 1, 6, 4, 5, 7});
    int ans=minimum_jumps(4, 4, 6, 6);
    cout<<ans<<'\n';
    for(auto c:pfx){
        for(auto d:c)cout<<d<<" ";cout<<"\n";
    }
    cout<<"\n";
    for(auto c:rch){
        for(auto d:c)cout<<d<<" ";cout<<"\n";
    }
    rt 0;
}*/

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