Submission #605201

#	Time	Username	Problem	Language	Result	Execution time	Memory
605201		lcj	Stations (IOI20_stations)	C++17	52.32 / 100	975 ms	732 KiB

stations

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;

#include "stations.h"
#define fi first
#define se second


void dfs(int cn, vector<int> &tin, vector<int> &tout, vector<vector<int>> &neighbours, int &cnt) {
    cnt++;
    tin[cn] = cnt;
    for (int nn : neighbours[cn]) {
        if (tin[nn] != -1) continue;
        dfs(nn, tin, tout, neighbours, cnt);
    }
    tout[cn] = cnt;
}

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
	vector<int> labels(n, -1);
    vector<vector<int>> adj(n);
    for (int i = 0; i < u.size(); i++)
    {
        adj[u[i]].push_back(v[i]);
        adj[v[i]].push_back(u[i]);
    }
    vector<int> tin(n, -1);
    vector<int> tout(n, -1);
    int cnt = -1;
    dfs(0, tin, tout, adj, cnt);
    if (cnt != n-1) {
        return {};
    }
    for (int i = 0; i < n; i++)
    {
        labels[i] = tin[i]*1000+tout[i];
    }
	return labels;
}

int find_next_station(int s, int t, vector<int> c) {
    pii m = {s / 1000, s % 1000};
    pii o = {t / 1000, t % 1000};
    vector<pii> vals;
    for (int i : c) {
        vals.push_back({i / 1000, i % 1000});
    }
    sort(vals.begin(), vals.end());
    for (int i = 1; i < vals.size(); i++)
    {
        if (vals[i].fi <= o.fi && o.fi <= vals[i].se) {
            return vals[i].fi*1000+vals[i].se;
        }
    }
    return vals[0].fi*1000+vals[0].se;
}

Compilation message (stderr)

stations.cpp: In function 'std::vector<int> label(int, int, std::vector<int>, std::vector<int>)':
stations.cpp:27:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |     for (int i = 0; i < u.size(); i++)
      |                     ~~^~~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:54:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |     for (int i = 1; i < vals.size(); i++)
      |                     ~~^~~~~~~~~~~~~
stations.cpp:47:9: warning: variable 'm' set but not used [-Wunused-but-set-variable]
   47 |     pii m = {s / 1000, s % 1000};
      |         ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 16 / 16
• Subtask 4: 10 / 10
• Subtask 5: 26.3205 / 61