Submission #418296

#	Time	Username	Problem	Language	Result	Execution time	Memory
418296		cfalas	Sky Walking (IOI19_walk)	C++14	10 / 100	4075 ms	398224 KiB

walk

#include "walk.h"
#include<bits/stdc++.h>
using namespace std;
#define mp make_pair
#define INF 10000000
#define MOD 1000000007
#define MID ((l+r)/2)
#define HASHMOD 2305843009213693951
#define ll long long
#define ull unsigned long long
#define F first
#define S second
typedef pair<ll, ll> ii;
typedef pair<ii, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef map<int, int> mii;

#define EPS 1e-6
#define FOR(i,n) for(int i=0;i<((int)(n));i++)
#define FORi(i,a,b) for(int i=((int)(a));i<((int)(b));i++)
#define FOA(v, a) for(auto v : a)
#define len(x) ((int) x.size())

long long min_distance(vector<int> x, vector<int> h, std::vector<int> l, std::vector<int> r, std::vector<int> y, int s, int g) {
	vector<vii> adj(len(x)+1);
	set<pair<int, ii> > events;
	map<ii, ll> dist;
	set<ii> vert;
	FOR(i, len(x)){
		events.insert({h[i], {1, i}});
		vert.insert({x[i], i});
	}
	FOR(i, len(y)){
		events.insert({y[i], {0, i}});
	}

	vector<set<int> > inters;
	inters.resize(len(x));
	
	FOA(v, events){
#ifdef LOCAL
		cout<<v.F<<" "<<v.S.F<<" "<<v.S.S<<endl;
#endif
		if(v.S.F==1){
			vert.erase({x[v.S.S], v.S.S});
		}
		else{
			ii b = {x[l[v.S.S]], x[r[v.S.S]]};
			auto it = vert.lower_bound({b.F, 0});
			auto ne = it++;
#ifdef LOCAL
			cout<<b.F<<" "<<b.S<<endl;
#endif
			while(it!=vert.end() && ne!=vert.end() && it->F<=b.S){
				adj[it->S].push_back({ne->S, v.F});
				adj[ne->S].push_back({it->S, v.F});
				inters[it->S].insert(v.F);
				inters[ne->S].insert(v.F);
				ne++, it++;
			}
		}
	}
#ifdef LOCAL
	FOR(i, len(x)){
		cout<<i<<": ";
		FOA(v, adj[i]) cout<<"("<<v.F<<" "<<v.S<<") ";
		cout<<endl;
	}
#endif
	FOR(i, len(x)){
		FOA(v, inters[i]) dist[{i, v}] = HASHMOD;
	}

	priority_queue<pair<ll, ii> > q;
	q.push({0, {s, 0}});
	dist[{s, 0}] = 0;
	while(!q.empty()){
		pair<ll, ii> t = q.top();
		q.pop();

		if(-t.F > dist[t.S]) continue;

#ifdef LOCAL
		cout<<t.S.F<<" "<<t.S.S<<": "<<t.F<<endl;
#endif

		FOA(v, adj[t.S.F]){
			ll new_d = abs(t.S.S - v.S)-t.F + abs(x[v.F]-x[t.S.F]);
			if(new_d < dist[v]){
				dist[v] = new_d;
				q.push({-dist[v], v});
			}
		}


	}

	ll ans = HASHMOD-1;
	FOA(v, inters[g]) ans = min(ans, dist[{g, v}]+v);
	if(ans==HASHMOD-1) return -1;
	return ans;
}

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