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Submission #587178

# Submission time Handle Problem Language Result Execution time Memory
587178 2022-07-01T12:40:44 Z GioChkhaidze Parachute rings (IOI12_rings) C++14
20 / 100
 4000 ms 92700 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, 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) {
			dfs(A, A, B);
			assert(cycle == true);
		}		
			else
		if (cycle) {
			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;
	}
	
	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:73:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |  for (int i = 0; i < v[x].size(); ++i) {
      |                  ~~^~~~~~~~~~~~~
rings.cpp:81:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   81 |  for (int i = 0; i < v[x].size(); ++i) {
      |                  ~~^~~~~~~~~~~~~
rings.cpp: In function 'int CountCritical()':
rings.cpp:104:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  104 |   for (int i = 0; i < v[degreemax].size(); ++i) {
      |                   ~~^~~~~~~~~~~~~~~~~~~~~
rings.cpp:116:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  116 |   for (int i = 0; i < v[degreemax].size(); ++i) {
      |                   ~~^~~~~~~~~~~~~~~~~~~~~
rings.cpp:131:1: warning: control reaches end of non-void function [-Wreturn-type]
  131 | }
      | ^

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 16 ms 24172 KB Output is correct
3 Correct 17 ms 24276 KB Output is correct
4 Correct 13 ms 23876 KB Output is correct
5 Correct 15 ms 24168 KB Output is correct
6 Correct 18 ms 24508 KB Output is correct
7 Correct 13 ms 24120 KB Output is correct
8 Correct 16 ms 24148 KB Output is correct
9 Correct 17 ms 24192 KB Output is correct
10 Correct 17 ms 24276 KB Output is correct

Subtask #2
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1763 ms 68552 KB Output is correct
2 Execution timed out 4075 ms 92700 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 16 ms 24172 KB Output is correct
3 Correct 17 ms 24276 KB Output is correct
4 Correct 13 ms 23876 KB Output is correct
5 Correct 15 ms 24168 KB Output is correct
6 Correct 18 ms 24508 KB Output is correct
7 Correct 13 ms 24120 KB Output is correct
8 Correct 16 ms 24148 KB Output is correct
9 Correct 17 ms 24192 KB Output is correct
10 Correct 17 ms 24276 KB Output is correct
11 Incorrect 17 ms 24260 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 16 ms 24172 KB Output is correct
3 Correct 17 ms 24276 KB Output is correct
4 Correct 13 ms 23876 KB Output is correct
5 Correct 15 ms 24168 KB Output is correct
6 Correct 18 ms 24508 KB Output is correct
7 Correct 13 ms 24120 KB Output is correct
8 Correct 16 ms 24148 KB Output is correct
9 Correct 17 ms 24192 KB Output is correct
10 Correct 17 ms 24276 KB Output is correct
11 Incorrect 17 ms 24260 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 16 ms 24172 KB Output is correct
3 Correct 17 ms 24276 KB Output is correct
4 Correct 13 ms 23876 KB Output is correct
5 Correct 15 ms 24168 KB Output is correct
6 Correct 18 ms 24508 KB Output is correct
7 Correct 13 ms 24120 KB Output is correct
8 Correct 16 ms 24148 KB Output is correct
9 Correct 17 ms 24192 KB Output is correct
10 Correct 17 ms 24276 KB Output is correct
11 Correct 1763 ms 68552 KB Output is correct
12 Execution timed out 4075 ms 92700 KB Time limit exceeded
13 Halted 0 ms 0 KB -