제출 #831346

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
831346		Trumling	기지국 (IOI20_stations)	C++14	컴파일 에러	0 ms	0 KiB

stations

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

#define F first
#define S second
#define all(x) x.begin(),x.end()
typedef long long ll;
#define pb push_back
#define INF 9999999999999999
vector<vector<int>>g;
vector<int> label(int n, int k, vector<int> u, vector<int> v) {

	g.assign(n,vector<int>());
	vector<bool>cnt(n,0);

	for (int i = 0; i < n-1; i++) {
		g[u[i]].pb(v[i]);
		g[v[i]].pb(u[i]);
		if(g[u[i]].size()==2)
		cnt[u[i]]=1;

		if(g[v[i]].size()==2)
		cnt[v[i]]=1;
	}
	vector<int>labels(N);

	for(int i=0;i<n;i++)
	if(cnt[i])
	{
		ll start=i,pre=i;
		ll idx=0;

		while(true)
		{
			label[start]=idx++;
			bool tf=0;

			for(auto x:g[start])
			if(x!=pre)
			{
				tf=1;
				swap(start,pre);
				start=x;
				break;
			}
			if(!tf)
			break;
		}
		break;
	}
	return labels;
}

int find_next_station(int s, int t, vector<int> c) 
{
	ll l=-1,r=INF;
	if(c.size()==1)
	{
		if(c[0]<s)
		l=c[0];
		else
		r=c[0];
	}
	else
	{
		l=min(c[0],c[1]);
		r=max(c[0],c[1]);
	}
	if(t>s)
	return r;
	else
	return l;

}

컴파일 시 표준 에러 (stderr) 메시지

stations.cpp: In function 'std::vector<int> label(int, int, std::vector<int>, std::vector<int>)':
stations.cpp:27:20: error: 'N' was not declared in this scope
   27 |  vector<int>labels(N);
      |                    ^
stations.cpp:37:15: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   37 |    label[start]=idx++;
      |               ^
stations.cpp:37:16: error: assignment of read-only location '*(label + ((sizetype)start))'
   37 |    label[start]=idx++;
      |    ~~~~~~~~~~~~^~~~~~