# 경비행기

Created
2021/03/23 01:58
문제 번호
2585
카테고리
그래프
이분탐색
BFS

### Code

@12/27/2020

2016 KB

#### 시간

8 ms
#include <iostream> #include <vector> int g_number_of_station; int g_number_of_through; int g_fuel; std::vector<std::pair<int, int>> g_pos; std::vector<bool> g_visited; void pre_setting(void) { std::ios_base::sync_with_stdio(false); std::cin.tie(NULL); std::cout.tie(NULL); } void input_action(void) { int i; int x; int y; std::cin >> g_number_of_station >> g_number_of_through; g_pos.reserve(g_number_of_station + 1); g_visited.reserve(g_number_of_station + 1); g_pos.push_back(std::make_pair(0, 0)); i = -1; while (++i < g_number_of_station) { std::cin >> x >> y; g_pos.push_back(std::make_pair(x, y)); } } int get_dist(int x1, int y1, int x2, int y2) { return ((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1)); } bool depth_search(int cur, int cnt, int lim) { int i; int c_to_n; int n_to_e; if (cnt > g_number_of_through) return (false); g_visited[cur] = true; i = -1; while (++i < g_number_of_station) { c_to_n = get_dist(g_pos[cur].first, g_pos[cur].second, g_pos[i].first, g_pos[i].second); n_to_e = get_dist(g_pos[i].first, g_pos[i].second, 10000, 10000); if ((!g_visited[i] && c_to_n <= lim) && (n_to_e <= lim || depth_search(i, cnt + 1, lim))) return (true); } return (false); } void binary_search(void) { int start; int mid; int end; int dist; start = 1; end = 1415; while (start <= end) { mid = (start + end) / 2; dist = mid * mid * 100; g_visited = std::vector<bool>(g_number_of_station + 1, false); if (depth_search(0, 0, dist)) end = mid - 1; else start = mid + 1; } g_fuel = start; } void output_action(void) { std::cout << g_fuel; } void solution(void) { input_action(); binary_search(); output_action(); } int main(void) { pre_setting(); solution(); return (0); }
C++