Submission #89323

#	Time	Username	Problem	Language	Result	Execution time	Memory
89323		vvash17	Triumphal arch (POI13_luk)	C++14	70 / 100	2097 ms	23900 KiB

luk

#include <iostream>
#include <vector>
#include <map>
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 main() {
	scanf("%d",&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++){
		int been_there[city_num+1] = {0};
		result = evaluate_result(1,need_num,been_there);
		if(result == 0){
			result = need_num;
			break;
		}
	}
	
	cout<<result<<endl;
    return 0;
}

Compilation message (stderr)

luk.cpp: In function 'int evaluate_result(int, int&, int*)':
luk.cpp:17:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i<graph[search_start].size(); i++){
                 ~^~~~~~~~~~~~~~~~~~~~~~~~~~~
luk.cpp: In function 'int main()':
luk.cpp:29:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&city_num);
  ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 10 / 10
• Subtask 10: 0 / 10