oj.uz

Submission #23659

# Submission time Handle Problem Language Result Execution time Memory
23659 2017-05-17T22:18:45 Z Hiasat Parachute rings (IOI12_rings) C++14
55 / 100
 4000 ms 114480 KB 
#include <bits/stdc++.h>

using namespace std;
int N;

int dsu[1000001], E[1000001], freq[1000001][5], sz[1000001], in[1000001], big[1000001][5], vis[1000001], vsId;

vector<int> adj[1000001];

bool block[1000001];

bool fn(int u, int p) {
	if (vis[u] == vsId) {
		return false;
	}
	if (!block[u] && in[u] > 2)
		return false;
	vis[u] = vsId;
	for (int i = 0; i < adj[u].size(); ++i) {
		int v = adj[u][i];
		if (v == p || block[v])
			continue;
		if (block[u] && vis[v] == vsId)
			continue;
		if (!fn(v, u))
			return false;
	}
	return true;
}
bool check(int u , int p) {
	block[u] = 1;
	vsId++;
	for (int i = 0; i < adj[u].size(); ++i) {
		in[adj[u][i]]--;
	}
	bool res = fn(u, p);
	for (int i = 0; i < adj[u].size(); ++i) {
		in[adj[u][i]]++;
	}
	block[u] = 0;
	return res;
}
void Init(int N_) {
	N = N_;
	for (int i = 0; i < N; ++i) {
		dsu[i] = i;
		freq[i][0] = 1;
		E[i] = 0;
		sz[i] = 1;
	}
}

int find(int u) {
	return dsu[u] == u ? u : dsu[u] = find(dsu[u]);
}

void Link(int A, int B) {
	adj[A].push_back(B);
	adj[B].push_back(A);
	freq[find(A)][in[A]]--;
	freq[find(B)][in[B]]--;
	in[A]++, in[B]++;
	in[A] = min(in[A], 4);
	in[B] = min(in[B], 4);
	freq[find(A)][in[A]]++;
	freq[find(B)][in[B]]++;
	if (find(A) != find(B)) {
		for (int i = 0 ; i <= 4  ; i++) {
			if (in[A] == i) {
				big[find(A)][i] = A;
			}
			if (in[B] == i) {
				big[find(B)][i] = B;
			}
		}
		E[find(B)] += E[find(A)];
		sz[find(B)] += sz[find(A)];
		for (int i = 0; i <= 4; ++i) {
			big[find(B)][i] = max(big[find(B)][i], big[find(A)][i]);
			freq[find(B)][i] += freq[find(A)][i];
		}
		dsu[find(A)] = find(B);
	}
	E[find(B)]++;
}

int CountCritical() {
	int res = 0;
	int wat = 0;
	int total = 0;
	bool can = true;
	for (int i = 0 ; i < N; ++i) {
		if(!can)
			break;
		if(wat > 1)
			break;
		if (find(i) == i) {
			if (freq[i][4] > 1){
				can = false;
				continue;
			}
			if (freq[i][4]) {

				if (check(big[i][4], -1)){
					res++;
				}
				if(res == 0)
					can = false;
				wat++;
			} else if (freq[i][3]) {

				if (check(big[i][3], -1)) {

					res++;
				}
				for (int j = 0 ; j < adj[big[i][3]].size(); j++) {
					int v = adj[big[i][3]][j];
					if (check(v, -1)) {
						res++;
					}
				}
				if(res == 0)
					can = false;
				wat++;
			} else {
				if(sz[i] > 0 && E[i] != sz[i]-1){
					wat++;
				}
				if(sz[i] && E[i] == sz[i])
					res = sz[find(i)];
				else if(sz[i] && E[i] == sz[i]-1){
					total += sz[find(i)];
				}else can = false;
				
			}
			
		}
	}
	if(wat == 0)
		res += total;
	if (!can || wat > 1)
		res = 0;
	return res;
}

Compilation message

rings.cpp: In function 'bool fn(int, int)':
rings.cpp:19:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < adj[u].size(); ++i) {
                  ~~^~~~~~~~~~~~~~~
rings.cpp: In function 'bool check(int, int)':
rings.cpp:33:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < adj[u].size(); ++i) {
                  ~~^~~~~~~~~~~~~~~
rings.cpp:37:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < adj[u].size(); ++i) {
                  ~~^~~~~~~~~~~~~~~
rings.cpp: In function 'int CountCritical()':
rings.cpp:116:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int j = 0 ; j < adj[big[i][3]].size(); j++) {
                      ~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 23928 KB Output is correct
2 Correct 26 ms 24444 KB Output is correct
3 Correct 28 ms 24588 KB Output is correct
4 Correct 22 ms 24588 KB Output is correct
5 Correct 24 ms 24588 KB Output is correct
6 Correct 26 ms 24588 KB Output is correct
7 Correct 23 ms 24588 KB Output is correct
8 Correct 23 ms 24588 KB Output is correct
9 Correct 26 ms 24592 KB Output is correct
10 Correct 26 ms 24592 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 798 ms 68908 KB Output is correct
2 Correct 1662 ms 96304 KB Output is correct
3 Correct 1941 ms 106288 KB Output is correct
4 Correct 2248 ms 110244 KB Output is correct
5 Correct 2238 ms 110376 KB Output is correct
6 Correct 2121 ms 110376 KB Output is correct
7 Correct 1884 ms 110376 KB Output is correct
8 Correct 2094 ms 110376 KB Output is correct
9 Correct 2488 ms 114480 KB Output is correct
10 Correct 1371 ms 114480 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 23928 KB Output is correct
2 Correct 26 ms 24444 KB Output is correct
3 Correct 28 ms 24588 KB Output is correct
4 Correct 22 ms 24588 KB Output is correct
5 Correct 24 ms 24588 KB Output is correct
6 Correct 26 ms 24588 KB Output is correct
7 Correct 23 ms 24588 KB Output is correct
8 Correct 23 ms 24588 KB Output is correct
9 Correct 26 ms 24592 KB Output is correct
10 Correct 26 ms 24592 KB Output is correct
11 Correct 31 ms 114480 KB Output is correct
12 Correct 38 ms 114480 KB Output is correct
13 Correct 37 ms 114480 KB Output is correct
14 Correct 46 ms 114480 KB Output is correct
15 Correct 52 ms 114480 KB Output is correct
16 Correct 37 ms 114480 KB Output is correct
17 Correct 30 ms 114480 KB Output is correct
18 Correct 32 ms 114480 KB Output is correct
19 Correct 35 ms 114480 KB Output is correct
20 Correct 35 ms 114480 KB Output is correct

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 23928 KB Output is correct
2 Correct 26 ms 24444 KB Output is correct
3 Correct 28 ms 24588 KB Output is correct
4 Correct 22 ms 24588 KB Output is correct
5 Correct 24 ms 24588 KB Output is correct
6 Correct 26 ms 24588 KB Output is correct
7 Correct 23 ms 24588 KB Output is correct
8 Correct 23 ms 24588 KB Output is correct
9 Correct 26 ms 24592 KB Output is correct
10 Correct 26 ms 24592 KB Output is correct
11 Correct 31 ms 114480 KB Output is correct
12 Correct 38 ms 114480 KB Output is correct
13 Correct 37 ms 114480 KB Output is correct
14 Correct 46 ms 114480 KB Output is correct
15 Correct 52 ms 114480 KB Output is correct
16 Correct 37 ms 114480 KB Output is correct
17 Correct 30 ms 114480 KB Output is correct
18 Correct 32 ms 114480 KB Output is correct
19 Correct 35 ms 114480 KB Output is correct
20 Correct 35 ms 114480 KB Output is correct
21 Execution timed out 4040 ms 114480 KB Time limit exceeded
22 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 23928 KB Output is correct
2 Correct 26 ms 24444 KB Output is correct
3 Correct 28 ms 24588 KB Output is correct
4 Correct 22 ms 24588 KB Output is correct
5 Correct 24 ms 24588 KB Output is correct
6 Correct 26 ms 24588 KB Output is correct
7 Correct 23 ms 24588 KB Output is correct
8 Correct 23 ms 24588 KB Output is correct
9 Correct 26 ms 24592 KB Output is correct
10 Correct 26 ms 24592 KB Output is correct
11 Correct 798 ms 68908 KB Output is correct
12 Correct 1662 ms 96304 KB Output is correct
13 Correct 1941 ms 106288 KB Output is correct
14 Correct 2248 ms 110244 KB Output is correct
15 Correct 2238 ms 110376 KB Output is correct
16 Correct 2121 ms 110376 KB Output is correct
17 Correct 1884 ms 110376 KB Output is correct
18 Correct 2094 ms 110376 KB Output is correct
19 Correct 2488 ms 114480 KB Output is correct
20 Correct 1371 ms 114480 KB Output is correct
21 Correct 31 ms 114480 KB Output is correct
22 Correct 38 ms 114480 KB Output is correct
23 Correct 37 ms 114480 KB Output is correct
24 Correct 46 ms 114480 KB Output is correct
25 Correct 52 ms 114480 KB Output is correct
26 Correct 37 ms 114480 KB Output is correct
27 Correct 30 ms 114480 KB Output is correct
28 Correct 32 ms 114480 KB Output is correct
29 Correct 35 ms 114480 KB Output is correct
30 Correct 35 ms 114480 KB Output is correct
31 Execution timed out 4040 ms 114480 KB Time limit exceeded
32 Halted 0 ms 0 KB -