oj.uz

답안 #587181

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
587181 2022-07-01T12:49:44 Z GioChkhaidze 낙하산 고리들 (IOI12_rings) C++14
20 / 100
 4000 ms 92872 KB 
#include <bits/stdc++.h>

#define pb push_back
#define f first
#define s second

using namespace std;

const int Nn = 1e6 + 6;

bool cycle, rekt, f[Nn], us[Nn], in_cycle[Nn];
int n, ans, degreemax, len, comp, p[Nn], sz[Nn];
set < pair < int , int > > st;
vector < int > v[Nn];

int P(int x) {
	if (p[x] == x) return x;
	return p[x] = P(p[x]);
}

void Init(int N_) {
	n = ans = N_;
	degreemax = 0;
	for (int i = 0; i < n; ++i) {
		st.insert({v[i].size(), i});
		p[i] = i;
	}
}

void dfs(int x, int p, int fn) {
	++len;
	in_cycle[x] = true;
	if (x == fn)  { cycle = true; return ; }
	for (int i = 0; i < v[x].size(); ++i) {
		int to = v[x][i];
		if (to != p) dfs(to, x, fn);
		if (cycle) return ;
	}
	in_cycle[x] = false;
	--len;
}

void Link(int A, int B) {
	int ap = P(A), bp = P(B);	
	if (ap != bp) {
		if (sz[ap] < sz[bp]) swap(ap, bp);	
		sz[ap] += sz[bp];
		p[bp] = ap;
	}
		else {
		if (!cycle) {
			comp = A;
			dfs(A, A, B);
			assert(cycle == true);
		}		
			else
		if (cycle && P(comp) != ap) {
			rekt = true;
		}
	}
	
	st.erase(st.find({v[A].size(), A}));
	st.erase(st.find({v[B].size(), B}));
	v[A].pb(B), v[B].pb(A);
	st.insert({v[A].size(), A});
	st.insert({v[B].size(), B});
	if (v[A].size() > v[degreemax].size()) degreemax = A;
	if (v[B].size() > v[degreemax].size()) degreemax = B;
}

bool check(int x) {
	if (cycle && !in_cycle[x]) return 0;
	st.erase(st.find({v[x].size(), x}));
	for (int i = 0; i < v[x].size(); ++i) {
		int to = v[x][i];
		st.erase(st.find({v[to].size(), to}));
		st.insert({v[to].size() - 1, to});
	}
	
	bool ok = true;
	if (st.size() && (*st.rbegin()).f > 2) ok = false;
	for (int i = 0; i < v[x].size(); ++i) {
		int to = v[x][i];
		st.erase(st.find({v[to].size() - 1, to}));
		st.insert({v[to].size(), to});
	}
	st.insert({v[x].size(), x});
	return ok;
}

int CountCritical() {
	if (rekt) return 0;
	if (v[degreemax].size() <= 2) {
		if (!cycle) return n;
		return len;
	}
	
	int res = 0;
	for (int i = 0; i < n; ++i) {
		res += check(i);
	}
	return res;
	
	if (v[degreemax].size() > 3) {
		if (cycle && !in_cycle[degreemax]) return 0;
		
		st.erase(st.find({v[degreemax].size(), degreemax}));
		if ((*st.rbegin()).f > 3) return 0;
		st.insert({v[degreemax].size(), degreemax});
		
		for (int i = 0; i < v[degreemax].size(); ++i) {
			us[v[degreemax][i]] = true;
		}
		
		bool ok = true;
		for (int i = 0; i < n; ++i) {
			if (i != degreemax && !us[i] && v[i].size() > 2) {
				ok = false;
				break;
			} 
		}
		
		for (int i = 0; i < v[degreemax].size(); ++i) {
			us[v[degreemax][i]] = false;
		}
		
		return ok;
	}
	
	if (v[degreemax].size() == 3) {
		int res = 0;
		res += check(degreemax);
		res += check(v[degreemax][0]);
		res += check(v[degreemax][1]);
		res += check(v[degreemax][2]);
		return res;
	}
}

Compilation message

rings.cpp: In function 'void dfs(int, int, int)':
rings.cpp:34:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |  for (int i = 0; i < v[x].size(); ++i) {
      |                  ~~^~~~~~~~~~~~~
rings.cpp: In function 'bool check(int)':
rings.cpp:74:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |  for (int i = 0; i < v[x].size(); ++i) {
      |                  ~~^~~~~~~~~~~~~
rings.cpp:82:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   82 |  for (int i = 0; i < v[x].size(); ++i) {
      |                  ~~^~~~~~~~~~~~~
rings.cpp: In function 'int CountCritical()':
rings.cpp:111:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  111 |   for (int i = 0; i < v[degreemax].size(); ++i) {
      |                   ~~^~~~~~~~~~~~~~~~~~~~~
rings.cpp:123:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  123 |   for (int i = 0; i < v[degreemax].size(); ++i) {
      |                   ~~^~~~~~~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 21 ms 24132 KB Output is correct
3 Correct 22 ms 24276 KB Output is correct
4 Correct 13 ms 23892 KB Output is correct
5 Correct 15 ms 24148 KB Output is correct
6 Correct 18 ms 24420 KB Output is correct
7 Correct 15 ms 24104 KB Output is correct
8 Correct 17 ms 24148 KB Output is correct
9 Correct 21 ms 24240 KB Output is correct
10 Correct 22 ms 24276 KB Output is correct

Subtask #2
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1757 ms 68656 KB Output is correct
2 Execution timed out 4077 ms 92872 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 21 ms 24132 KB Output is correct
3 Correct 22 ms 24276 KB Output is correct
4 Correct 13 ms 23892 KB Output is correct
5 Correct 15 ms 24148 KB Output is correct
6 Correct 18 ms 24420 KB Output is correct
7 Correct 15 ms 24104 KB Output is correct
8 Correct 17 ms 24148 KB Output is correct
9 Correct 21 ms 24240 KB Output is correct
10 Correct 22 ms 24276 KB Output is correct
11 Incorrect 76 ms 24268 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 21 ms 24132 KB Output is correct
3 Correct 22 ms 24276 KB Output is correct
4 Correct 13 ms 23892 KB Output is correct
5 Correct 15 ms 24148 KB Output is correct
6 Correct 18 ms 24420 KB Output is correct
7 Correct 15 ms 24104 KB Output is correct
8 Correct 17 ms 24148 KB Output is correct
9 Correct 21 ms 24240 KB Output is correct
10 Correct 22 ms 24276 KB Output is correct
11 Incorrect 76 ms 24268 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 21 ms 24132 KB Output is correct
3 Correct 22 ms 24276 KB Output is correct
4 Correct 13 ms 23892 KB Output is correct
5 Correct 15 ms 24148 KB Output is correct
6 Correct 18 ms 24420 KB Output is correct
7 Correct 15 ms 24104 KB Output is correct
8 Correct 17 ms 24148 KB Output is correct
9 Correct 21 ms 24240 KB Output is correct
10 Correct 22 ms 24276 KB Output is correct
11 Correct 1757 ms 68656 KB Output is correct
12 Execution timed out 4077 ms 92872 KB Time limit exceeded
13 Halted 0 ms 0 KB -