Submission #480003

#	Time	Username	Problem	Language	Result	Execution time	Memory
480003		stefantaga	기지국 (IOI20_stations)	C++14	0 / 100	994 ms	728 KiB

stations

#include "stations.h"
#include <cstdio>
#include <cassert>
#include <map>
#include <vector>
#include <algorithm>
#include <bits/stdc++.h>
using namespace std;
int viz[1505],nr;
vector <int> gr[1505];
void dfs(int x,int tata)
{
    viz[x]=nr;
    nr++;
    for (int i=0;i<gr[x].size();i++)
    {
        if (gr[x][i]!=tata)
        {
            dfs(gr[x][i],x);
        }
    }
}
std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
	std::vector<int> labels(n);
	for (int i=0;i<n;i++)
    {
        viz[i]=0;
        gr[i].clear();
    }
	for (int i=0;i<n-1;i++)
    {
        gr[u[i]].push_back(v[i]);
        gr[v[i]].push_back(u[i]);
    }
    nr=0;
    dfs(0,-1);
    for (int i=0;i<n;i++)
    {
        labels[i]=viz[i];
    }
	return labels;
}

int find_next_station(int s, int t, std::vector<int> c) {
    if (c.size()==1)
    {
        return c[0];
    }
    int i;
    if (s==0)
    {
        for (i=0;i<c.size()-1;i++)
        {
            if (c[i]<=t&&t<c[i+1])
            {
                return c[i];
            }
        }
        return c[c.size()-1];
    }
	else
    {
        if (!(c[1]<=t&&t<=c[c.size()-1]))
        {
            return c[0];
        }
        for (i=1;i<c.size()-1;i++)
        {
            if (c[i]<=t&&t<c[i+1])
            {
                return c[i];
            }
        }
        return c[c.size()-1];
    }
}
#ifdef HOME
static int max_label = 0;
static int r, n, k, q;
static std::vector<int> u, v, labels, answers;
static std::map<int, int> reverse_labels;
static std::vector<std::vector<int>> adjlist;
static int s, t, w;
static std::vector<int> c;

int main() {
	assert(scanf("%d", &r) == 1);
	for (int tc = 0; tc < r; tc++) {
		assert(scanf("%d%d", &n, &k) == 2);
		u.resize(n - 1);
		v.resize(n - 1);
		adjlist.clear();
		adjlist.resize(n);
		for (int i = 0; i < n - 1; i++) {
			assert(scanf("%d%d", &u[i], &v[i]) == 2);
			adjlist[u[i]].push_back(v[i]);
			adjlist[v[i]].push_back(u[i]);
		}
		labels = label(n, k, u, v);
		if ((int)labels.size() != n) {
			printf("Number of labels not equal to %d\n", n);
			exit(0);
		}
		reverse_labels.clear();
		for (int i = 0; i < n; i++) {
			if (labels[i] < 0 || labels[i] > k) {
				printf("Label not in range 0 to %d\n", k);
				exit(0);
			}
			if (reverse_labels.find(labels[i]) != reverse_labels.end()) {
				printf("Labels not unique\n");
				exit(0);
			}
			reverse_labels[labels[i]] = i;
			if (labels[i] > max_label) {
				max_label = labels[i];
			}
		}
		assert(scanf("%d", &q) == 1);
		for (int i = 0; i < q; i++) {
			assert(scanf("%d%d%d", &s, &t, &w) == 3);
			c.clear();
			for (int v : adjlist[s]) {
				c.push_back(labels[v]);
			}
			std::sort(c.begin(), c.end());
			int answer = find_next_station(labels[s], labels[t], c);
			if (!std::binary_search(c.begin(), c.end(), answer)) {
				printf("Label %d returned by find_next_station not found in c\n", answer);
				exit(0);
			}
			answers.push_back(reverse_labels[answer]);
		}
	}
	printf("%d\n", max_label);
	for (int index : answers) {
		printf("%d\n", index);
	}
	exit(0);
}

#endif // HOME

Compilation message (stderr)

stations.cpp: In function 'void dfs(int, int)':
stations.cpp:15:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |     for (int i=0;i<gr[x].size();i++)
      |                  ~^~~~~~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:52:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |         for (i=0;i<c.size()-1;i++)
      |                  ~^~~~~~~~~~~
stations.cpp:67:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |         for (i=1;i<c.size()-1;i++)
      |                  ~^~~~~~~~~~~

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