oj.uz

Submission #587182

# Submission time Handle Problem Language Result Execution time Memory
587182 2022-07-01T12:57:17 Z GioChkhaidze Parachute rings (IOI12_rings) C++14
20 / 100
 3979 ms 187688 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;
	}
	assert(n <= 5000);
	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

# Verdict Execution time Memory Grader output
1 Correct 11 ms 23764 KB Output is correct
2 Correct 25 ms 24148 KB Output is correct
3 Correct 21 ms 24280 KB Output is correct
4 Correct 12 ms 23892 KB Output is correct
5 Correct 14 ms 24188 KB Output is correct
6 Correct 20 ms 24420 KB Output is correct
7 Correct 14 ms 24020 KB Output is correct
8 Correct 21 ms 24128 KB Output is correct
9 Correct 22 ms 24276 KB Output is correct
10 Correct 23 ms 24276 KB Output is correct

Subtask #2
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1875 ms 68720 KB Output is correct
2 Runtime error 3979 ms 187688 KB Execution killed with signal 6
3 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 23764 KB Output is correct
2 Correct 25 ms 24148 KB Output is correct
3 Correct 21 ms 24280 KB Output is correct
4 Correct 12 ms 23892 KB Output is correct
5 Correct 14 ms 24188 KB Output is correct
6 Correct 20 ms 24420 KB Output is correct
7 Correct 14 ms 24020 KB Output is correct
8 Correct 21 ms 24128 KB Output is correct
9 Correct 22 ms 24276 KB Output is correct
10 Correct 23 ms 24276 KB Output is correct
11 Incorrect 75 ms 24220 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 23764 KB Output is correct
2 Correct 25 ms 24148 KB Output is correct
3 Correct 21 ms 24280 KB Output is correct
4 Correct 12 ms 23892 KB Output is correct
5 Correct 14 ms 24188 KB Output is correct
6 Correct 20 ms 24420 KB Output is correct
7 Correct 14 ms 24020 KB Output is correct
8 Correct 21 ms 24128 KB Output is correct
9 Correct 22 ms 24276 KB Output is correct
10 Correct 23 ms 24276 KB Output is correct
11 Incorrect 75 ms 24220 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 23764 KB Output is correct
2 Correct 25 ms 24148 KB Output is correct
3 Correct 21 ms 24280 KB Output is correct
4 Correct 12 ms 23892 KB Output is correct
5 Correct 14 ms 24188 KB Output is correct
6 Correct 20 ms 24420 KB Output is correct
7 Correct 14 ms 24020 KB Output is correct
8 Correct 21 ms 24128 KB Output is correct
9 Correct 22 ms 24276 KB Output is correct
10 Correct 23 ms 24276 KB Output is correct
11 Correct 1875 ms 68720 KB Output is correct
12 Runtime error 3979 ms 187688 KB Execution killed with signal 6
13 Halted 0 ms 0 KB -