Submission #1060547

#	Time	Username	Problem	Language	Result	Execution time	Memory
1060547		ArthuroWich	Stations (IOI20_stations)	C++17	100 / 100	629 ms	1444 KiB

stations

#include "stations.h"
#include<bits/stdc++.h>
using namespace std;
vector<int> adj[1005];
int timer = 0, st[1005], en[1005], l[1005];
void dfs(int i, int p, int d) {
    st[i] = timer;
    timer++;
    if (d % 2 == 0) {
        l[i] = st[i];
    }
    for (int j : adj[i]) {
        if (j == p) {
            continue;
        }
        dfs(j, i, d+1);
    }
    en[i] = timer;
    timer++;
    if (d % 2 == 1) {
        l[i] = en[i];
    }
}
vector<int> label(int n, int k, vector<int> u, vector<int> v) {
    vector<int> labels(n);
    timer = 0;
    for (int i = 0; i <= n; i++) {
        adj[i].clear();
        en[i] = 0;
    }
    int leaf = 0;
    for (int i = 0; i < n-1; i++) {
        adj[u[i]].push_back(v[i]);
        adj[v[i]].push_back(u[i]);
    }
    for (int i = 0; i < n; i++) {
        sort(adj[i].begin(), adj[i].end());
        if (adj[i].size() == 1) {
            leaf = i;
        }
    }
    dfs(leaf, -1, 0);
    vector<int> ind;
    for (int i = 0; i < n; i++) {
        ind.push_back(l[i]);
    }
    sort(ind.begin(), ind.end());
    for (int i = 0; i < n; i++) {
        labels[i] = lower_bound(ind.begin(), ind.end(), l[i]) - ind.begin();
    }
    return labels;
}
int find_next_station(int s, int t, vector<int> c) {
    int ins = -1, outs = -1;
    if (c.size() == 1) {
        return c.back();
    }
    if (s == t) {
        return s;
    }
    for (int i : c) {
        if (i == t) {
            return t;
        }
    }
    if (s == 0) {
        vector<int> in(c.size()), out(c.size());
        ins = s;
        outs = c.back()+1;
        for (int i = 0; i < c.size(); i++) {
            out[i] = c[i];
            if (i == 0) {
                in[i] = ins+1;
            } else {
                in[i] = out[i-1]+1;
            }
        }
        for (int i = 0; i < c.size(); i++) {
            if (in[i] < t && t < out[i]) {
                return c[i];
            }
        }
        return c.back();
    } else {
        int inp = -1, outp = -1;
        vector<int> in(c.size()-1), out(c.size()-1);
        if (s < c.front()) {
            inp = s-1;
            outp = c.back();
            c.pop_back();
            ins = s;
            outs = c.back()+1;
            for (int i = 0; i < c.size(); i++) {
                out[i] = c[i];
                if (i == 0) {
                    in[i] = ins;
                } else {
                    in[i] = out[i-1];
                }
            }
            for (int i = 0; i < c.size(); i++) {
                if (in[i] < t && t < out[i]) {
                    return c[i];
                }
            }
            return outp;
        } else {
            inp = c.front();
            outp = s+1;
            c.erase(c.begin());
            ins = c.front()-1;
            outs = s;
            for (int i = c.size()-1; i >= 0; i--) {
                in[i] = c[i];
                if (i == c.size()-1) {
                    out[i] = outs;
                } else {
                    out[i] = in[i+1];
                }
            }
            for (int i = 0; i < c.size(); i++) {
                if (in[i] < t && t < out[i]) {
                    return c[i];
                }
            }
            return inp;
        }
    }
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:70:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |         for (int i = 0; i < c.size(); i++) {
      |                         ~~^~~~~~~~~~
stations.cpp:78:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   78 |         for (int i = 0; i < c.size(); i++) {
      |                         ~~^~~~~~~~~~
stations.cpp:93:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   93 |             for (int i = 0; i < c.size(); i++) {
      |                             ~~^~~~~~~~~~
stations.cpp:101:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  101 |             for (int i = 0; i < c.size(); i++) {
      |                             ~~^~~~~~~~~~
stations.cpp:115:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  115 |                 if (i == c.size()-1) {
      |                     ~~^~~~~~~~~~~~~
stations.cpp:121:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  121 |             for (int i = 0; i < c.size(); i++) {
      |                             ~~^~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 8 / 8
• Subtask 3: 16 / 16
• Subtask 4: 10 / 10
• Subtask 5: 61 / 61