제출 #926742

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
926742		ByeWorld	기지국 (IOI20_stations)	C++14	0 / 100	567 ms	940 KiB

stations

#include "stations.h"
#include <vector>
#include <bits/stdc++.h>
#define fi first
#define se second
#define pb push_back
using namespace std;
typedef pair<int,int> pii;
typedef pair<pii,int> ipii;
const int MAXN = 2e3+10;
const int MAX = 1e3;

int n, k;
vector <int> adj[MAXN];
vector <int> lab;
int cnt;

void dfs(int nw, int par, int val){
	lab[nw] = val; cnt++;
	for(auto nx : adj[nw]){
		if(nx == par) continue;
		dfs(nx, nw, val+1);
	}
}

vector<int> label(int N, int K, vector<int> u, vector<int> v) {
	n = N; k = K;
	lab.clear(); lab.resize(n);
	for(int i=0; i<=n; i++) adj[i].clear();

	for(int i=0; i<n-1; i++){
		adj[u[i]].pb(v[i]); adj[v[i]].pb(u[i]);
	}

	bool b = 0;
	for(int i=0; i<n; i++){
		if(adj[i].size() > 2){
			lab[i] = 0; // pivot
			for(int j=0; j<adj[i].size(); j++){
				dfs(adj[i][j], i, j*MAX+1);
			}
			b = 1;
		}
	}
	if(!b){ // line
		lab[0] = 0;
		if(adj[0].size() == 1){
			dfs(adj[0][0], 0, 1);
		} else {
			dfs(adj[0][0], 0, 1);
			dfs(adj[0][1], 0, cnt+1);
		}
	}
	//for(int i=0; i<n; i++) cout << i << ' ' << lab[i] << " p\n";

	return lab;
}

int find_next_station(int s, int t, vector<int> c) {

	int cs = s/MAX, ct = t/MAX;
	if(s==0){
		return ct*MAX+1; // ke bagiannya t
	}

	if(cs == ct){
		if(s < t){ // s ... t
			return s+1;
		}
	}
	int ans = s-1;
	if((ans % MAX) == 0) return 0;
	return ans;
}

컴파일 시 표준 에러 (stderr) 메시지

stations.cpp: In function 'std::vector<int> label(int, int, std::vector<int>, std::vector<int>)':
stations.cpp:39:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |    for(int j=0; j<adj[i].size(); j++){
      |                 ~^~~~~~~~~~~~~~

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