답안 #149603

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
149603 2019-09-01T06:48:48 Z 서울대학교 연구공원 944동 삼성전자서울대연구소(#3600, ho94949, dotorya, zigui) 갈라파고스 여행 (FXCUP4_island) C++17
31 / 100
5000 ms 37860 KB
#include "island.h"

#include <stdio.h>  
#include <algorithm>  
#include <assert.h>
#include <bitset>
#include <cmath>  
#include <complex>  
#include <deque>  
#include <functional>  
#include <iostream>  
#include <limits.h>  
#include <map>  
#include <math.h>  
#include <queue>  
#include <set>  
#include <stdlib.h>  
#include <string.h>  
#include <string>  
#include <time.h>  
#include <unordered_map>  
#include <unordered_set>  
#include <vector>  

#pragma warning(disable:4996)  
#pragma comment(linker, "/STACK:336777216")  
using namespace std;

#define mp make_pair  
#define Fi first  
#define Se second  
#define pb(x) push_back(x)  
#define szz(x) ((int)(x).size())  
#define rep(i, n) for(int i=0;i<n;i++)  
#define all(x) (x).begin(), (x).end()  
#define ldb ldouble  

typedef tuple<int, int, int> t3;
typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef long double ldb;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;
typedef pair <ll, int> pli;
typedef pair <db, db> pdd;

int IT_MAX = 1 << 19;
const ll MOD = 1000000007;
const int INF = 0x3f3f3f3f;
const ll LL_INF = 0x3f3f3f3f3f3f3f3f;
const db PI = acos(-1);
const db ERR = 1e-10;

int r[100050];
int sz[100050][2];
int root(int x) {
	return (x == r[x]) ? x : (r[x] = root(r[x]));
}

vector <pair<pii, int>> Ve;
vector <pii> conn[100050];
int par[100050][20][2];
int dep[100050];

int tus;
int lr[100050][2];
bool dchk[100050];
void DFS(int n) {
	lr[n][0] = ++tus;
	dchk[n] = true;
	for (auto it : conn[n]) {
		if (dchk[it.second]) continue;
		int nn = it.second;
		par[nn][0][0] = n;
		par[nn][0][1] = it.first;
		for (int i = 1; i < 20; i++) {
			int p = par[nn][i - 1][0];
			par[nn][i][0] = par[p][i - 1][0];
			par[nn][i][1] = min(par[p][i - 1][1], par[nn][i - 1][1]);
		}
		dep[nn] = dep[n] + 1;
		DFS(nn);
	}

	lr[n][1] = tus;
}

pii upnode(int a, int c) {
	int mn = INF;
	for (int i = 19; i >= 0; i--) {
		if (c & (1 << i)) {
			mn = min(mn, par[a][i][1]);
			a = par[a][i][0];
		}
	}
	return pii(a, mn);
}
int lca(int a, int b) {
	if (dep[a] > dep[b]) swap(a, b);

	int c = dep[b] - dep[a];
	b = upnode(b, c).first;

	if (a == b) return a;

	for (int i = 19; i >= 0; i--) {
		if (par[a][i][0] != par[b][i][0]) {
			a = par[a][i][0];
			b = par[b][i][0];
		}
	}
	return par[a][0][0];
}

int ch[100050]; // answer array
int ans[305][100050];
int col[100050];
vector <int> Vc[100050];

int u[100050];
int dis[100050];
void Init(int K, std::vector<int> F, std::vector<int> S, std::vector<int> E){
	int N = F.size(), M = S.size(), i, j;

	for (i = 0; i < N; i++) col[i] = F[i];
	for (i = 0; i < N; i++) Vc[F[i]].push_back(i);

	for (i = 0; i < N; i++) r[i] = i;
	for (i = M - 1; i >= 0; i--) {
		int t1 = S[i], t2 = E[i];
		if (root(t1) == root(t2)) continue;
		int r1 = root(t1), r2 = root(t2);
		r[r1] = r2;
		Ve.emplace_back(pii(t1, t2), i);
		conn[t1].emplace_back(i, t2);
		conn[t2].emplace_back(i, t1);
	}
	for (i = 0; i < 20; i++) {
		par[0][i][0] = 0;
		par[0][i][1] = INF;
	}
	DFS(0);
	
	for (i = 0; i < K; i++) u[i] = i;
	sort(u, u + K, [](int a, int b) {
		if (Vc[a].size() != Vc[b].size()) return Vc[a].size() > Vc[b].size();
		return a > b;
	});

	for (i = 0; i < K; i++) ch[i] = -1;

	priority_queue <pii> Hx;
	for (i = 0; i < K && i < 0; i++) {
		int c = u[i];
		ch[c] = i;
		for (j = 0; j < N; j++) dis[j] = -1;
		for (auto it : Vc[c]) {
			dis[it] = INF;
			Hx.emplace(INF, it);
		}
		while (!Hx.empty()) {
			pii u = Hx.top();
			Hx.pop();
			if (dis[u.second] != u.first) continue;
			for (auto it : conn[u.second]) {
				pii u2 = pii(min(u.first, it.first), it.second);
				if (dis[u2.second] < u2.first) {
					dis[u2.second] = u2.first;
					Hx.push(u2);
				}
			}
		}
		for (j = 0; j < K; j++) ans[i][j] = -1;
		for (j = 0; j < N; j++) ans[i][F[j]] = max(ans[i][F[j]], dis[j]);
	}

	for (i = 0; i < N; i++) {
		r[i] = i;
		sz[i][0] = sz[i][1] = 0;
	}
}

int ispar(int a, int b) {
	if (dep[a] <= dep[b]) return -INF;

	pii u = upnode(a, dep[a] - dep[b]);
	if (u.first == b) return u.second;
	else return -INF;
}

int Separate(int A, int B){
	if (ch[A] >= 0) return ans[ch[A]][B] + 1;
	if (ch[B] >= 0) return ans[ch[B]][A] + 1;

	vector <int> Vl;
	vector <int> Vl2;
	vector <int> Vu;
	for (auto it : Vc[A]) Vl.push_back(it);
	for (auto it : Vc[B]) Vl.push_back(it);
	sort(all(Vl), [](int a, int b) {
		return lr[a][0] < lr[b][0];
	});
	Vl.erase(unique(all(Vl)), Vl.end());

	for (int i = 0; i + 1 < Vl.size(); i++) Vl2.push_back(lca(Vl[i], Vl[i + 1]));
	for (auto it : Vl) Vl2.push_back(it);

	sort(all(Vl2), [](int a, int b) {
		return lr[a][0] < lr[b][0];
	});
	Vl2.erase(unique(all(Vl2)), Vl2.end());
	Vl = Vl2;

	Vu.clear();
	Vu.push_back(Vl[0]);

	vector <pair<int, pii>> Vet;
	for (int i = 1; i < Vl.size(); i++) {
		int rv;
		
		while (1) {
			rv = ispar(Vl[i], Vu.back());
			if (rv != -INF) break;
			Vu.pop_back();
		}
		
		Vet.emplace_back(rv, pii(Vl[i], Vu.back()));
		Vu.push_back(Vl[i]);
	}
	sort(all(Vet));
	reverse(all(Vet));

	for (auto it : Vl) {
		r[it] = it;
		sz[it][0] = sz[it][1] = 0;
		if (col[it] == A) sz[it][0] = 1;
		if (col[it] == B) sz[it][1] = 1;
	}

	for (auto it : Vet) {
		int r1 = root(it.second.first), r2 = root(it.second.second);
		if (r1 == r2) continue;

		sz[r1][0] += sz[r2][0];
		sz[r1][1] += sz[r2][1];
		r[r2] = r1;
		if (sz[r1][0] && sz[r1][1]) return it.first + 1;
	}
	return 0;
}

Compilation message

island.cpp:25:0: warning: ignoring #pragma warning  [-Wunknown-pragmas]
 #pragma warning(disable:4996)  
 
island.cpp:26:0: warning: ignoring #pragma comment  [-Wunknown-pragmas]
 #pragma comment(linker, "/STACK:336777216")  
 
island.cpp: In function 'int Separate(int, int)':
island.cpp:206:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i + 1 < Vl.size(); i++) Vl2.push_back(lca(Vl[i], Vl[i + 1]));
                  ~~~~~~^~~~~~~~~~~
island.cpp:219:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 1; i < Vl.size(); i++) {
                  ~~^~~~~~~~~~~
island.cpp: In function 'void Init(int, std::vector<int>, std::vector<int>, std::vector<int>)':
island.cpp:155:14: warning: array subscript is below array bounds [-Warray-bounds]
   int c = u[i];
           ~~~^
# 결과 실행 시간 메모리 Grader output
1 Correct 360 ms 37860 KB Output is correct
2 Correct 368 ms 37600 KB Output is correct
3 Correct 410 ms 37860 KB Output is correct
4 Correct 408 ms 37856 KB Output is correct
5 Correct 381 ms 37860 KB Output is correct
6 Correct 385 ms 37856 KB Output is correct
7 Correct 409 ms 37860 KB Output is correct
8 Correct 406 ms 37860 KB Output is correct
9 Correct 401 ms 37860 KB Output is correct
10 Correct 406 ms 37756 KB Output is correct
# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 5120 KB Output is correct
2 Correct 8 ms 5120 KB Output is correct
3 Execution timed out 5098 ms 36136 KB Time limit exceeded
4 Halted 0 ms 0 KB -
# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 5120 KB Output is correct
2 Correct 8 ms 5120 KB Output is correct
3 Correct 360 ms 37860 KB Output is correct
4 Correct 368 ms 37600 KB Output is correct
5 Correct 410 ms 37860 KB Output is correct
6 Correct 408 ms 37856 KB Output is correct
7 Correct 381 ms 37860 KB Output is correct
8 Correct 385 ms 37856 KB Output is correct
9 Correct 409 ms 37860 KB Output is correct
10 Correct 406 ms 37860 KB Output is correct
11 Correct 401 ms 37860 KB Output is correct
12 Correct 406 ms 37756 KB Output is correct
13 Execution timed out 5098 ms 36136 KB Time limit exceeded
14 Halted 0 ms 0 KB -