제출 #772556

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
772556		khshg	기지국 (IOI20_stations)	C++14	76 / 100	781 ms	748 KiB

stations

#include"stations.h"
#include<bits/stdc++.h>
using namespace std;

vector<vector<int>> adj;
vector<int> L, R, sz;
vector<bool> flor;

void dfs(int s, int p, int low, bool flr) {
	flor[s] = flr;
	L[s] = low;
	R[s] = low;
	sz[s] = 1;
	int nxt_low = low + 1;
	for(auto& u : adj[s]) {
		if(u == p) continue;
		dfs(u, s, nxt_low, flr ^ 1);
		sz[s] += sz[u];
		nxt_low = R[u] + 1;
		R[s] = R[u] + 1;
	}
}

pair<int, int> conv(int s) {
	return {s % 1000, s / 1000};
}
int conv(pair<int, int> s) {
	return s.first + s.second * 1000;
}

vector<int> label(int N, int K, vector<int> u, vector<int> v) {
	flor.resize(N);
	sz.resize(N);
	L.resize(N);
	R.resize(N);
	adj.resize(N);
	for(auto& I : adj) I.clear();
	for(int i = 0; i < (int)u.size(); ++i) {
		adj[u[i]].push_back(v[i]);
		adj[v[i]].push_back(u[i]);
	}
	dfs(0, -1, 0, 0);
	vector<int> labels(N);
	for(int i = 0; i < N; ++i) labels[i] = (flor[i] ? R[i] : L[i]);
	return labels;
}

int find_next_station(int s, int t, vector<int> c) {
	if(s == 0) {
		pair<int, int> S = {0, c.back() + 1}, T = {t, t};
		vector<pair<int, int>> C((int)c.size());
		C[0] = {1, c[0]};
		for(int i = 1; i < (int)c.size(); ++i) {
			C[i] = {c[i - 1] + 1, c[i]};
		}
		int ans = -1;
		for(int i = 0; i < (int)c.size(); ++i) {
			if(C[i].first <= T.second && C[i].second >= T.second) ans = i;
		}
		return c[ans];
	}
	if(s < c[0]) {
		pair<int, int> S = {s, c.back() - 1}, T = {t, t};
		vector<pair<int, int>> C((int)c.size());
		C[0] = {s + 1, c[0]};
		C.back() = {s - 1, c.back()};
		for(int i = 1; i + 1 < (int)c.size(); ++i) {
			C[i] = {c[i - 1] + 1, c[i]};
		}
		int par = -1, ans = -1;
		for(int i = 0; i < (int)c.size(); ++i) {
			if(C[i].first <= S.first && C[i].second >= S.second) par = i;
			else if(C[i].first <= T.second && C[i].second >= T.second) ans = i;
		}
		return (ans == -1 ? c[par] : c[ans]);
	}
	pair<int, int> S = {c[0] + 1, s}, T = {t, t};
	vector<pair<int, int>> C((int)c.size());
	C.back() = {c.back(), s - 1};
	C[0] = {c[0], s + 1};
	for(int i = 1; i + 1 < (int)c.size(); ++i) {
		C[i] = {c[i], c[i + 1] - 1};
	}
	int par = -1, ans = -1;
	for(int i = 0; i < (int)c.size(); ++i) {
		if(C[i].first <= S.first && C[i].second >= S.second) par = i;
		else if(C[i].first <= T.second && C[i].second >= T.second) ans = i;
	}
	return (ans == -1 ? c[par] : c[ans]);
/*	pair<int, int> S = conv(s), T = conv(t);
	vector<pair<int, int>> C((int)c.size());
	for(int i = 0; i < (int)c.size(); ++i) C[i] = conv(c[i]);
	int par = -1, ans = -1;
	for(int i = 0; i < (int)c.size(); ++i) {
		if(C[i].first <= S.first && C[i].second >= S.second) par = i;
		else if(C[i].first <= T.second && C[i].second >= T.second) ans = i;
	}
	return (ans == -1 ? conv(C[par]) : conv(C[ans]));*/
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:50:18: warning: variable 'S' set but not used [-Wunused-but-set-variable]
   50 |   pair<int, int> S = {0, c.back() + 1}, T = {t, t};
      |                  ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 16 / 16
• Subtask 4: 10 / 10
• Subtask 5: 50 / 61