Submission #360609

#	Time	Username	Problem	Language	Result	Execution time	Memory
360609		juggernaut	Sky Walking (IOI19_walk)	C++14	10 / 100	4065 ms	102096 KiB

walk

#include<bits/stdc++.h>
#include"walk.h"
#ifndef EVAL
#include"grader.cpp"
#endif
using namespace std;
vector<int>e[100000],b[100000];
vector<pair<int,int>>adj[100000];
long long min_distance(vector<int>x,vector<int>h,vector<int>l,vector<int>r,vector<int>y,int s,int g){
	map<int,int>curr;
	priority_queue<pair<long long,pair<int,int>>>q;
	map<pair<int,int>,long long>val;
	set<pair<int,int>>vis;
	for(int i=0;i<r.size();i++){
		e[r[i]].push_back(y[i]);
		b[l[i]].push_back(y[i]);
	}
	for(int i=0;i<x.size();i++){
		for(auto& to:curr){
			if(to.first>h[i])break;
			adj[i].push_back({to.second,to.first});
			adj[to.second].push_back({i,to.first});
			to.second=i;
		}
		for(auto to:e[i])curr.erase(to);
		for(auto to:b[i])curr[to]=i;
	}
	val[{s,0}]=0;
	q.push({0,{s,0}});
	while(!q.empty()){
		auto v=q.top().second;
		q.pop();
		if(vis.count(v))continue;
		vis.insert(v);
		for(auto to:adj[v.first]){
			if(vis.count(to)||(val.count(to)&&val[to]<=val[v]+abs(v.second-to.second)+abs(x[v.first]-x[to.first])))continue;
			val[to]=val[v]+abs(v.second-to.second)+abs(x[v.first]-x[to.first]);
			q.push({-val[to],to});
		}
	}
	long long ans=1e18;
	for(auto v:val)
		if(v.first.first==g)ans=min(ans,v.second+v.first.second);
	if(ans==1e18)ans=-1;
	return ans;
}

Compilation message (stderr)

walk.cpp: In function 'long long int min_distance(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, int, int)':
walk.cpp:14:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |  for(int i=0;i<r.size();i++){
      |              ~^~~~~~~~~
walk.cpp:18:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |  for(int i=0;i<x.size();i++){
      |              ~^~~~~~~~~

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