Submission #88841

#	Time	Username	Problem	Language	Result	Execution time	Memory
88841		zviki	Triumphal arch (POI13_luk)	C++14	100 / 100	1400 ms	29228 KiB

luk

#include <iostream>
#include <algorithm>
#include <vector>
#include <unordered_set>

#define avg(a ,b) ((a + b) / 2)

using namespace std;

vector<vector<int>> map_of_cities;

int num_not_satisfy(int visited_set[], int num_workers, int city)
{	
	int i, child_city, children = map_of_cities[city].size(), rec_res, num_children = 0;
	visited_set[city] = 1;
	for (i = 0, rec_res = 0; i < children; i++) {
		child_city = map_of_cities[city][i];
		if (visited_set[child_city] ==  0) {
			num_children++;
			rec_res += num_not_satisfy(visited_set, num_workers, child_city);
		}	
	}
	if (num_children + rec_res < num_workers) {
		return 0;
	} else {
		return num_children + rec_res - num_workers;
	}
}

int main() 
{
	int n, i, res, bsearch_start, bsearch_end, bsearch_mid, road_from, road_to; 	
	cin >> n;
	for (i = 0; i < n; i++) { 
		vector<int> temp;
		map_of_cities.push_back(temp);
	}
	for (i = 1; i < n; i++) {
		cin >> road_from >> road_to;
		map_of_cities[road_from - 1].push_back(road_to - 1);
		map_of_cities[road_to - 1].push_back(road_from - 1);
	}

	bsearch_start = 0, bsearch_end = n;

	for (; bsearch_start < bsearch_end; ) {
		bsearch_mid = avg(bsearch_start, bsearch_end);
		int visited_set[n + 5] = { 0 };
		res = num_not_satisfy(visited_set, bsearch_mid, 0);
		if (res != 0) {
			bsearch_start = bsearch_mid + 1;
		} else {
			bsearch_end = bsearch_mid;
		}
	}

	res = bsearch_start;
	cout << res << endl;
	return 0;
}

• 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: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10