oj.uz

Submission #587180

# Submission time Handle Problem Language Result Execution time Memory
587180 2022-07-01T12:47:33 Z GioChkhaidze Parachute rings (IOI12_rings) C++14
20 / 100
 4000 ms 92532 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) != A) {
			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

# Verdict Execution time Memory Grader output
1 Correct 15 ms 23712 KB Output is correct
2 Correct 22 ms 24128 KB Output is correct
3 Correct 22 ms 24280 KB Output is correct
4 Correct 12 ms 23848 KB Output is correct
5 Correct 18 ms 24148 KB Output is correct
6 Correct 20 ms 24464 KB Output is correct
7 Correct 18 ms 24108 KB Output is correct
8 Correct 15 ms 24148 KB Output is correct
9 Correct 25 ms 24276 KB Output is correct
10 Correct 22 ms 24204 KB Output is correct

Subtask #2
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1915 ms 68648 KB Output is correct
2 Execution timed out 4098 ms 92532 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 23712 KB Output is correct
2 Correct 22 ms 24128 KB Output is correct
3 Correct 22 ms 24280 KB Output is correct
4 Correct 12 ms 23848 KB Output is correct
5 Correct 18 ms 24148 KB Output is correct
6 Correct 20 ms 24464 KB Output is correct
7 Correct 18 ms 24108 KB Output is correct
8 Correct 15 ms 24148 KB Output is correct
9 Correct 25 ms 24276 KB Output is correct
10 Correct 22 ms 24204 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

# Verdict Execution time Memory Grader output
1 Correct 15 ms 23712 KB Output is correct
2 Correct 22 ms 24128 KB Output is correct
3 Correct 22 ms 24280 KB Output is correct
4 Correct 12 ms 23848 KB Output is correct
5 Correct 18 ms 24148 KB Output is correct
6 Correct 20 ms 24464 KB Output is correct
7 Correct 18 ms 24108 KB Output is correct
8 Correct 15 ms 24148 KB Output is correct
9 Correct 25 ms 24276 KB Output is correct
10 Correct 22 ms 24204 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

# Verdict Execution time Memory Grader output
1 Correct 15 ms 23712 KB Output is correct
2 Correct 22 ms 24128 KB Output is correct
3 Correct 22 ms 24280 KB Output is correct
4 Correct 12 ms 23848 KB Output is correct
5 Correct 18 ms 24148 KB Output is correct
6 Correct 20 ms 24464 KB Output is correct
7 Correct 18 ms 24108 KB Output is correct
8 Correct 15 ms 24148 KB Output is correct
9 Correct 25 ms 24276 KB Output is correct
10 Correct 22 ms 24204 KB Output is correct
11 Correct 1915 ms 68648 KB Output is correct
12 Execution timed out 4098 ms 92532 KB Time limit exceeded
13 Halted 0 ms 0 KB -