제출 #348075

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
348075		blue	Stations (IOI20_stations)	C++17	0 / 100	5 ms	620 KiB

stations

#include "stations.h"
#include <iostream>
#include <vector>
using namespace std;

vector<int> edge[1000];
vector<int> visit(1000, 0);
vector<int> L;

int dfs(int u, int a, bool flag) //vertex, minimum label, left/right?     return largest unused label
{
    visit[u] = 1;

    if(flag == 0)
    {
        L[u] = a;
        a++;
    }

    for(int v: edge[u])
    {
        if(visit[v]) continue;
        a = dfs(v, a, !flag);
    }

    if(flag == 1)
    {
        L[u] = a;
        a++;
    }

    return a;
}

/*
        0
      / | \
     1  2  3
    / \  \
   4   5  6
*/

vector<int> label(int n, int k, vector<int> u, vector<int> v)
{
    for(int j = 0; j < n-1; j++)
    {
        edge[u[j]].push_back(v[j]);
        edge[v[j]].push_back(u[j]);
    }

    L = vector<int>(n, -1);

    dfs(0, 0, 0);

    return L;
}

int find_next_station(int s, int t, vector<int> c)
{
    if(s < c[0]) // s is left label
    {
        if(t < s) return c.back();
        for(int i = 0; i < c.size(); i++) if(t <= c[i]) return c[i];
    }
    else // s is right label
    {
        if(t > s) return c[0];
        for(int i = c.size()-1; i >= 0; i--) if(t >= c[i]) return c[i];
    }
}

컴파일 시 표준 에러 (stderr) 메시지

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:63:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |         for(int i = 0; i < c.size(); i++) if(t <= c[i]) return c[i];
      |                        ~~^~~~~~~~~~
stations.cpp:70:1: warning: control reaches end of non-void function [-Wreturn-type]
   70 | }
      | ^

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