Submission #932254

#	Time	Username	Problem	Language	Result	Execution time	Memory
932254		salmon	Sky Walking (IOI19_walk)	C++14	0 / 100	4003 ms	20052 KiB

walk

#include "walk.h"
#include <bits/stdc++.h>
using namespace std;

map<int,pair<int,int>> sky[100100];
map<int,long long int> d[100100];
map<int,set<int>> uber;
set<int> sat;
vector<pair<int,int>> v;
vector<pair<int,int>> w;


priority_queue<pair<long long int, pair<int,int>>,vector<pair<long long int, pair<int,int>>>,greater<pair<long long int, pair<int,int>>>> pq;

long long min_distance(vector<int> x, vector<int> h, vector<int> l, vector<int> r, vector<int> y, int s, int g) {

    int N = x.size();

    for(int i = 0; i < N; i++){
        l.push_back(i);
        r.push_back(i);
        y.push_back(0);

        v.push_back({h[i],i});
        sat.insert(i);
    }

    sort(v.begin(),v.end(),greater<pair<int,int>>());

    int M = l.size();

    for(int i = 0; i < M; i++){
        w.push_back({y[i],i});
    }

    sort(w.begin(),w.end());

    for(int i = 0; i < M; i++){
        while(v.back().first < w[i].first){
            sat.erase(v.back().second);
            v.pop_back();
        }

        int j = w[i].second;

        auto it = sat.lower_bound(l[j]);

        while(it != sat.end() && (*it) <= r[i]){
            int k = (*it);
            uber[y[j]].insert(*it);
            if(sky[k].find(y[j]) != sky[j].end()){
                sky[k][y[j]].first = min(sky[j][y[j]].first,l[j]);
                sky[k][y[j]].second = max(sky[j][y[j]].second,r[j]);
            }
            else{
                sky[k][y[j]] = make_pair(l[j],r[j]);
            }
            advance(it,1);
        }
    }

    pq.push({0,{s,0}});

    while(!pq.empty()){
        pair<long long int, pair<int,int>> iii = pq.top();
        pq.pop();
        pair<int,int> ii = iii.second;

        if(d[ii.first].find(ii.second) != d[ii.first].end()){
            continue;
        }

        d[ii.first][ii.second] = iii.first;

        auto it = sky[ii.first].find(ii.second);

        advance(it,1);

        if(it != sky[ii.first].end()){
            pq.push({iii.first + (it -> first) - ii.second, {ii.first, it -> first}});
        }

        advance(it,-1);

        if(it != sky[ii.first].begin()){
            advance(it,-1);
            pq.push({iii.first + ii.second - (it -> first), {ii.first, it -> first}});
        }

        auto grab = uber[ii.second].find(ii.first);

        advance(grab,1);

        if(grab != uber[ii.second].end() && (*grab) <= sky[ii.first][ii.second].second){
            pq.push({iii.first + x[(*grab)] - x[ii.first], {(*grab), ii.second}});
        }

        advance(grab,-1);

        if(grab != uber[ii.second].begin()){
            advance(grab,-1);
            if(sky[ii.first][ii.second].first <= (*grab) ){
                pq.push({iii.first + x[ii.first] - x[(*grab)], {(*grab), ii.second}});
            }
        }


    }

    if(d[g].find(0) == d[g].end()) return -1;

	return d[g][0];
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 14
• Subtask 3: 0 / 15
• Subtask 4: 0 / 18
• Subtask 5: 0 / 43