Submission #890239

#	Time	Username	Problem	Language	Result	Execution time	Memory
890239		vjudge1	Sky Walking (IOI19_walk)	C++17	0 / 100	3816 ms	1048576 KiB

walk

#include "walk.h"
#include <bits/stdc++.h>

using namespace std;

using vi = vector<int>;
using ll = long long;
using ii = pair<int, int>;

struct Dijkstra {
    vector<vector<ii> > L;
    int n;

    Dijkstra(int N) : n(N), L(N) {}

    void add_edge(int u, int v, int w) {
        L[u].push_back({v, w});
        L[v].push_back({u, w});
    }

    ll dist(int s, int t) {
        const ll INF = 1e18;
        vector<ll> D(n, INF);
        D[s] = 0;
        priority_queue<pair<ll, int> > PQ;
        PQ.push({0, s});
        while(!PQ.empty()) {
            int u = PQ.top().second;
            int d = - PQ.top().first;
            PQ.pop();
            if(D[u] != d) continue;
            for(auto [it, w] : L[u]) {
                if(D[it] > D[u] + w) {
                    D[it] = D[u] + w;
                    PQ.push({-D[it], it});
                }
            }
        }
        if(D[t] == INF) D[t] = -1;
        return D[t];
    }
};

long long min_distance(std::vector<int> x, std::vector<int> h, std::vector<int> l, std::vector<int> r, std::vector<int> y, int s, int g) {
    int n = x.size();
    int tmr = 0;
    vector<vector<pair<int, int> > > Noduri(n); /// perechi(id, h)
    vector<tuple<int, int, int> > E;
    for(int i = 0; i < n; ++i) {
        Noduri[i].push_back({tmr++, 0});
    }
    for(int i = 0; i < l.size(); ++i) {
        int ult = -1;
        for(int j = l[i]; j <= r[i]; ++j) {
            if(h[j] < y[i]) continue;
            else {
                Noduri[j].push_back({tmr++, y[i]});
                if(ult != -1) {
                    E.emplace_back(tmr - 1, Noduri[ult].back().first, x[j] - x[ult]);
                }
                ult = j;
            }
        }
    }

    Dijkstra Sol(tmr);

    for(auto [u, v, w] : E)
        Sol.add_edge(u, v, w);

    for(int i = 0; i < n; ++i) {
        sort(Noduri[i].begin(), Noduri[i].end(), [&](auto a, auto b) {return a.second < b.second;});
        for(int j = 0; j + 1 < Noduri[i].size(); ++j) {
            Sol.add_edge(Noduri[i][j].first, Noduri[i][j + 1].first,
                    Noduri[i][j + 1].second - Noduri[i][j].second);
        }
    }
	return Sol.dist(Noduri[s][0].first, Noduri[g][0].first);
}

Compilation message (stderr)

walk.cpp: In constructor 'Dijkstra::Dijkstra(int)':
walk.cpp:12:9: warning: 'Dijkstra::n' will be initialized after [-Wreorder]
   12 |     int n;
      |         ^
walk.cpp:11:25: warning:   'std::vector<std::vector<std::pair<int, int> > > Dijkstra::L' [-Wreorder]
   11 |     vector<vector<ii> > L;
      |                         ^
walk.cpp:14:5: warning:   when initialized here [-Wreorder]
   14 |     Dijkstra(int N) : n(N), L(N) {}
      |     ^~~~~~~~
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:52:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |     for(int i = 0; i < l.size(); ++i) {
      |                    ~~^~~~~~~~~~
walk.cpp:73:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |         for(int j = 0; j + 1 < Noduri[i].size(); ++j) {
      |                        ~~~~~~^~~~~~~~~~~~~~~~~~

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