oj.uz

답안 #587218

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
587218 2022-07-01T13:49:17 Z GioChkhaidze 낙하산 고리들 (IOI12_rings) C++14
20 / 100
 4000 ms 94872 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, new_cycle = false, REKT, f[Nn], us[Nn], in_cycle[Nn];
int n, ans, CM = -1, degreemax, len, comp, p[Nn], sz[Nn], pr[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) {
	pr[x] = p;
	if (x == fn)  { 
		len = 1;
		cycle = true; 
		in_cycle[x] = true;
		while (x != pr[x]) {
			++len;
			x = pr[x];
			in_cycle[x] = 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 ;
	}
}

bool okr;
void wfs(int x, int p, int fn) {
	pr[x] = p;
	if (CM == -1 && in_cycle[x]) CM = x;
		else
	if (CM != x && in_cycle[x]) REKT = true;
		else
	if (CM == x && in_cycle[x]) okr = true;
	
	if (x == fn)  { 
		new_cycle = true; 
		in_cycle[x] = true;
		while (x != pr[x]) {
			x = pr[x];
			in_cycle[x] = true;
		}
		return ;
	}
	
	for (int i = 0; i < v[x].size(); ++i) {
		int to = v[x][i];
		if (to != p) wfs(to, x, fn);
		if (new_cycle || REKT) return ;
	}
}

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) {
			if (!REKT) {
				new_cycle = false;
				if (CM == -1) {
					wfs(A, A, B);
					if (CM == -1) {
						REKT = true;
					}
				}
					else {
					okr = false;
					wfs(A, A, B);
					if (!okr) 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 && (CM == -1 && !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:43:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |  for (int i = 0; i < v[x].size(); ++i) {
      |                  ~~^~~~~~~~~~~~~
rings.cpp: In function 'void wfs(int, int, int)':
rings.cpp:69:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   69 |  for (int i = 0; i < v[x].size(); ++i) {
      |                  ~~^~~~~~~~~~~~~
rings.cpp: In function 'bool check(int)':
rings.cpp:120:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  120 |  for (int i = 0; i < v[x].size(); ++i) {
      |                  ~~^~~~~~~~~~~~~
rings.cpp:128:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  128 |  for (int i = 0; i < v[x].size(); ++i) {
      |                  ~~^~~~~~~~~~~~~
rings.cpp: In function 'int CountCritical()':
rings.cpp:156:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  156 |   for (int i = 0; i < v[degreemax].size(); ++i) {
      |                   ~~^~~~~~~~~~~~~~~~~~~~~
rings.cpp:168:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  168 |   for (int i = 0; i < v[degreemax].size(); ++i) {
      |                   ~~^~~~~~~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 23764 KB Output is correct
2 Correct 21 ms 24232 KB Output is correct
3 Correct 24 ms 24240 KB Output is correct
4 Correct 13 ms 23924 KB Output is correct
5 Correct 17 ms 24208 KB Output is correct
6 Correct 19 ms 24468 KB Output is correct
7 Correct 15 ms 24064 KB Output is correct
8 Correct 17 ms 24148 KB Output is correct
9 Correct 23 ms 24224 KB Output is correct
10 Correct 27 ms 24332 KB Output is correct

Subtask #2
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1944 ms 70832 KB Output is correct
2 Execution timed out 4072 ms 94872 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 23764 KB Output is correct
2 Correct 21 ms 24232 KB Output is correct
3 Correct 24 ms 24240 KB Output is correct
4 Correct 13 ms 23924 KB Output is correct
5 Correct 17 ms 24208 KB Output is correct
6 Correct 19 ms 24468 KB Output is correct
7 Correct 15 ms 24064 KB Output is correct
8 Correct 17 ms 24148 KB Output is correct
9 Correct 23 ms 24224 KB Output is correct
10 Correct 27 ms 24332 KB Output is correct
11 Incorrect 85 ms 24284 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 23764 KB Output is correct
2 Correct 21 ms 24232 KB Output is correct
3 Correct 24 ms 24240 KB Output is correct
4 Correct 13 ms 23924 KB Output is correct
5 Correct 17 ms 24208 KB Output is correct
6 Correct 19 ms 24468 KB Output is correct
7 Correct 15 ms 24064 KB Output is correct
8 Correct 17 ms 24148 KB Output is correct
9 Correct 23 ms 24224 KB Output is correct
10 Correct 27 ms 24332 KB Output is correct
11 Incorrect 85 ms 24284 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 23764 KB Output is correct
2 Correct 21 ms 24232 KB Output is correct
3 Correct 24 ms 24240 KB Output is correct
4 Correct 13 ms 23924 KB Output is correct
5 Correct 17 ms 24208 KB Output is correct
6 Correct 19 ms 24468 KB Output is correct
7 Correct 15 ms 24064 KB Output is correct
8 Correct 17 ms 24148 KB Output is correct
9 Correct 23 ms 24224 KB Output is correct
10 Correct 27 ms 24332 KB Output is correct
11 Correct 1944 ms 70832 KB Output is correct
12 Execution timed out 4072 ms 94872 KB Time limit exceeded
13 Halted 0 ms 0 KB -