Submission #956803

#	Time	Username	Problem	Language	Result	Execution time	Memory
956803		12345678	Stations (IOI20_stations)	C++17	0 / 100	579 ms	1008 KiB

stations

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

using namespace std;

const int nx=1e3+5;
int in[nx], out[nx], lvl[nx], cnt, pa, t1, t2;
vector<int> res, d[nx];
map<int, pair<int, int>> mp;

void dfs(int u, int p)
{
    in[u]=++cnt;
    lvl[u]=lvl[p]+1;
    for (auto v:d[u]) if (v!=p) dfs(v, u);
    out[u]=++cnt;
    if (lvl[u]%2) res[u]=in[u];
    else res[u]=2000+out[u];
}

std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
    cnt=-1;
    t1=0;
    for (int i=0; i<n; i++) d[i].clear();
    res.resize(n);
    for (int i=0; i<n-1; i++) d[u[i]].push_back(v[i]), d[v[i]].push_back(u[i]);
    lvl[0]=0;
    dfs(0, 0);
    for (int i=0; i<n; i++)
    {
        if (res[i]>=2000) mp[res[i]-2000]={i, 1};
        else mp[res[i]]={i, 0};
    }
    for (auto [x, y]:mp)
    {
        if (y.second) res[y.first]=x+t1+1000, t1++;
        else res[y.first]=x+t1, t1++;
    }
	return res;
}

int find_next_station(int s, int t, std::vector<int> c) {
    if (c.size()==1) return c[0];
    if (t>=1000) t-=1000;
    if (s<1000)
    {
        for (auto &x:c) x-=1000;
        if (s==0) for (auto x:c) if (t<=x) return x+1000;
        pa=c.back();
        //cout<<"here "<<s<<' '<<pa<<' '<<t<<'\n';
        for (int i=0; i<c.size()-1; i++) if (s<=t&&t<=c[i]) return c[i]+1000;
        return pa+1000;
    }
    else
    {
        s-=1000;
        pa=c.front();
        for (int i=c.size()-1; i>0; i--) if (c[i]<=t&&t<=s) return c[i];
        return pa;
    }
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:51:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |         for (int i=0; i<c.size()-1; i++) if (s<=t&&t<=c[i]) return c[i]+1000;
      |                       ~^~~~~~~~~~~

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