Submission #611877

#	Time	Username	Problem	Language	Result	Execution time	Memory
611877		Hanksburger	Sky Walking (IOI19_walk)	C++17	10 / 100	1377 ms	540524 KiB

walk

#include "walk.h"
#include <bits/stdc++.h>
using namespace std;
vector<pair<int, int> > adj[2000005], tor[100005];
vector<pair<pair<int, int>, int> > vec;
priority_queue<pair<int, int> > pq;
map<pair<int, int>, int> mp;
long long dist[2000005];
set<pair<int, int> > s;
bool visited[2000005];
long long min_distance(vector<int> x, vector<int> h, vector<int> l, vector<int> r, vector<int> y, int a, int b)
{
	int n=x.size(), m=y.size(), ind=0, cnt=0;
    for (int i=0; i<m; i++)
    {
        vec.push_back({{l[i], 0}, i});
        vec.push_back({{r[i], 1}, i});
    }
    sort(vec.begin(), vec.end());
    for (int i=0; i<n; i++)
    {
        while (ind!=m*2 && vec[ind].first<=make_pair(i, 0))
        {
            if (vec[ind].first.second)
            {
                s.erase({y[vec[ind].second], vec[ind].second});
//                cout << "s erase " << y[vec[ind].second] << ' ' << vec[ind].second << '\n';
            }
            else
            {
                s.insert({y[vec[ind].second], vec[ind].second});
//                cout << "s insert " << y[vec[ind].second] << ' ' << vec[ind].second << '\n';
            }
            ind++;
        }
        mp[{x[i], 0}]=(++cnt);
//        cout << "mp " << x[i] << ' ' << 0 << ' ' << cnt << '\n';
        int pre=0;
        for (auto itr=s.begin(); itr!=s.end(); itr++)
        {
            int fi=itr->first, se=itr->second;
            if (fi>h[i])
                break;
            tor[se].push_back({x[i], fi});
            if (!mp[{x[i], fi}])
            {
                mp[{x[i], fi}]=(++cnt);
//                cout << "mp " << x[i] << ' ' << fi << ' ' << cnt << '\n';
                adj[cnt-1].push_back({cnt, fi-pre});
                adj[cnt].push_back({cnt-1, fi-pre});
                pre=fi;
            }
        }
    }
    for (int j=0; j<m; j++)
    {
        for (int k=1; k<tor[j].size(); k++)
        {
            int u=mp[tor[j][k-1]], v=mp[tor[j][k]], w=tor[j][k].first-tor[j][k-1].first;
            adj[u].push_back({v, w});
            adj[v].push_back({u, w});
        }
    }
    a=mp[{x[a], 0}];
    b=mp[{x[b], 0}];
    for (int i=1; i<=cnt; i++)
        dist[i]=1e18;
    dist[a]=0;
    pq.push({0, a});
    while (!pq.empty())
    {
        int u=pq.top().second;
        pq.pop();
        if (visited[u])
            continue;
        visited[u]=1;
        for (int i=0; i<adj[u].size(); i++)
        {
            int v=adj[u][i].first, w=adj[u][i].second;
            if (dist[u]+w<dist[v])
            {
                dist[v]=dist[u]+w;
                pq.push({-dist[v], v});
            }
        }
    }
    return dist[b]==1e18?-1:dist[b];
}

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:57:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |         for (int k=1; k<tor[j].size(); k++)
      |                       ~^~~~~~~~~~~~~~
walk.cpp:77:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   77 |         for (int i=0; i<adj[u].size(); i++)
      |                       ~^~~~~~~~~~~~~~

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