Submission #728067

#	Time	Username	Problem	Language	Result	Execution time	Memory
728067		grossly_overconfident	Rainforest Jumps (APIO21_jumps)	C++17	37 / 100	4045 ms	27072 KiB

jumps

//#include "jumps.h"
#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
//#define int long long
vector<vector<int>> adj;
bool verdict = true;
void init(int n, vector<int> h){
    for (int i = 0; i < n; ++i){
        if (i + 1 != h[i]){
            verdict = false;
            break;
        }
    }
    if (verdict){
        return;
    }
    adj.resize(n);
    set<pair<int, int>> s;
    vector<int> m(n);
    for (int i = 0; i < n; ++i){
        s.insert({i, h[i]});
        m[h[i] - 1] = i;
    }
    for (int i = 0; i < n; ++i){
        vector<int> to_push;
        auto it = s.find({m[i], i + 1});
        if (it != s.begin()){
            auto it2 = it;
            it2--;
            to_push.push_back((*it2).first);
        }
        if (it != (--s.end())){
            auto it2 = it;
            it2++;
            to_push.push_back((*it2).first);
        }
        adj[m[i]] = to_push;
        s.erase(it);
    }
}


int minimum_jumps(int a, int b, int c, int d){

    if (verdict){
        if (b >= c && a <= d){
            return 0;
        }
        if (a < c){
            return c - b;
        }
        return -1;
    }

    queue<pair<int, int>> q;
    unordered_set<int> s, f;
    vector<bool> v(adj.size());
    for (int i = a; i <= b; ++i){
        s.insert(i);
    }
    for (int i = c; i <= d; ++i){
        f.insert(i);
    }
    for (int i : s){
        q.push({0, i});
    }
    while (!q.empty()){
        auto t = q.front();
        q.pop();
        if (v[t.second]){
            continue;
        }
        v[t.second] = true;
        if (f.find(t.second) != f.end()){
            return t.first;
        }
        for (int i : adj[t.second]){
            q.push({t.first + 1, i});
        }
    }
    return -1;
}



/*
signed main(){
    
    //cin.tie(0);
    //iostream::sync_with_stdio(0);

    int n, q;
    cin >> n >> q;
    vector<int> k(n);
    for (int i = 0; i < n; ++i){
        cin >> k[i];
    }
    init(n, k);
    for (int i = 0; i < adj.size(); ++i){
        cout << i << ": ";
        for (auto j : adj[i]){
            cout << j << " ";
        }
        cout << endl;
    }
    for (int i = 0; i < q; ++i){
        int a, b, c, d;
        cin >> a >> b >> c >> d;
        cout << minimum_jumps(a, b, c, d) << 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