Submission #396254

#	Time	Username	Problem	Language	Result	Execution time	Memory
396254		faresbasbs	Stations (IOI20_stations)	C++14	100 / 100	1124 ms	844 KiB

stations

#include <bits/stdc++.h>
#include "stations.h"
using namespace std;

void dfs(int curr , int par , int hi , vector<vector<int>> &graph , int &cnt , vector<int> &ret){
	if(hi%2 == 0){
		ret[curr] = cnt;
		cnt += 1;
	}
	for(auto i : graph[curr]){
		if(i == par){
			continue;
		}
		dfs(i,curr,hi+1,graph,cnt,ret);
	}
	if(hi%2 == 1){
		ret[curr] = cnt;
		cnt += 1;
	}
}

vector<int> label(int n , int k , vector<int> u , vector<int> v){
	vector<vector<int>> graph(1001);
	int cnt = 0;
	for(int i = 0 ; i < u.size() ; i += 1){
		graph[u[i]].push_back(v[i]);
		graph[v[i]].push_back(u[i]);
	}
	vector<int> labels(n);
	dfs(0,0,0,graph,cnt,labels);
	return labels;
}

int find_next_station(int s , int t , vector<int> c){
	sort(c.begin(),c.end());
	if(c.size() == 1){
		return c[0];
	}
	if(s < c[0]){
		if(t >= s && t <= c[c.size()-2]){
			for(int i = 0 ; i < c.size() ; i += 1){
				if(t <= c[i]){
					return c[i];
				}
			}
		}
		return c.back();
	}else{
		if(t <= s && t >= c[1]){
			for(int i = c.size()-1 ; i >= 0 ; i -= 1){
				if(t >= c[i]){
					return c[i];
				}
			}
		}
		return c[0];
	}
}

Compilation message (stderr)

stations.cpp: In function 'std::vector<int> label(int, int, std::vector<int>, std::vector<int>)':
stations.cpp:25:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |  for(int i = 0 ; i < u.size() ; i += 1){
      |                  ~~^~~~~~~~~~
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:41:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |    for(int i = 0 ; i < c.size() ; i += 1){
      |                    ~~^~~~~~~~~~

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