Submission #887759

#	Time	Username	Problem	Language	Result	Execution time	Memory
887759		Iliya_	Rainforest Jumps (APIO21_jumps)	C++17	37 / 100	4011 ms	14556 KiB

jumps

//IN THE NAME OF GOD
#include<bits/stdc++.h>
#pragma GCC optimize("O2,unroll-loops")
#define endl        '\n'
#define F           first
#define S           second
#define pii         pair<int,int>
#define all(x)      x.begin(),x.end()
#define pb          push_back
#define fast_io     ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define file_io     freopen("input.in" , "r" , stdin) ; freopen("output.out" , "w" , stdout);
using namespace std;
typedef long long ll; 
typedef long double dll;

const int N = 2e5+7, inf = 1e9; 
vector<int> g[N],vec; 
int dist[N], n;
bool sub1 = false; 
queue<int> q;

#include "jumps.h"
void init(int _n, vector<int> h){
     n = _n;
     sub1 = true; 
     for(int i=0; i<n; i++) if (h[i] != i+1) sub1 = false; 
     vec.pb(0);
     for(int i=0; i<n; i++){
          while(vec.size() && h[vec.back()] < h[i]) vec.pop_back();
          if (vec.size()) g[i].pb(vec.back());
          vec.pb(i);
     }
     vec.clear();
     vec.pb(n-1);
     for(int i=n-2; i>=0; i--){
          while(vec.size() && h[vec.back()] < h[i]) vec.pop_back();
          if (vec.size()) g[i].pb(vec.back());
          vec.pb(i); 
     }
}

int minimum_jumps(int a, int b, int c, int d){
     if (sub1) return c-b; 
     fill(dist,dist+n,inf);
     for(int i=a; i<=b; i++){
          dist[i] = 0;
          q.push(i); 
     }
     while(q.size()){
          int v = q.front(); q.pop();
          for(int u : g[v]){
               if (dist[u] > dist[v] + 1){
                    dist[u] = dist[v] + 1; 
                    q.push(u); 
               }
          }
     }
     int mn = inf;
     for(int i=c; i<=d; i++) mn = min(mn,dist[i]);
     return (mn == inf ? -1 : mn);
}

/*
int32_t main(){
     fast_io;
     vector<int> tmp = {3, 2, 1, 6, 4, 5, 7};
     init(7, tmp);
     for(int i=0; i<n; i++){
          cout << "Hello " << i << endl;
          for(int u : g[i]) cout << u << " ";
          cout << endl;
     }
     cout << minimum_jumps(4, 4, 6, 6) << endl;
     return 0;
}
*/

• Subtask 1: 4 / 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