제출 #89317

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
89317		vvash17	새로운 문제 (POI13_luk)	C++14	0 / 100	411 ms	17580 KiB

luk

#include <cstdio>
#include <vector>
#include <map>
#include <iostream>
using namespace std;

vector<int> graph[300001];
int city_num,from,to;

int evaluate_result(int search_start,int &need_num,int been_there[]){
	int available_neigbours = 0;
	int sub_tree_res = 0;
	
	been_there[search_start]++;
	
	for(int i = 0; i<graph[search_start].size(); i++){
		if(been_there[graph[search_start][i]] == 0){
			available_neigbours++;
			sub_tree_res += evaluate_result(graph[search_start][i],need_num,been_there);
		}
	}
	
	int res = available_neigbours-(need_num-sub_tree_res);
	if(res < 0)return 0;
	return res;
}
int search_init(int &need_num){
	if(need_num < 2)return 0;
	int been_there[city_num+1];
	for(int i = 0; i<=city_num; i++)been_there[i] = 0;
	
	return evaluate_result(1,need_num,been_there);
}
int main() {
	cin>>city_num;
	for(int i = 1; i<city_num; i++){
		cin>>from>>to;
		graph[from].push_back(to);
		graph[to].push_back(from);
	}
	int result = 0;
	
	for(int need_num = 0; need_num<=city_num; need_num++){
		result = search_init(need_num);
		if(result == 0){
			result = need_num;
			break;
		}
	}
	
	cout<<result<<endl;
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

luk.cpp: In function 'int evaluate_result(int, int&, int*)':
luk.cpp:18:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i<graph[search_start].size(); i++){
                 ~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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