oj.uz

Submission #223736

# Submission time Handle Problem Language Result Execution time Memory
223736 2020-04-16T09:12:18 Z staniewzki Parachute rings (IOI12_rings) C++17
38 / 100
 4000 ms 47964 KB 
#include<bits/stdc++.h>
using namespace std;
 
#define REP(i, n) for(int i = 0; i < n; i++)
 
template<class T> int size(T && a) { return (int) a.size(); }

struct Graph {
	vector<int> rep, deg;
	int excluded = -1;

	int find(int x) {
		return rep[x] < 0 ? x : find(rep[x]);
	}

	int bicomp = -1;
	int get_cycle() {
		return -rep[find(bicomp)];
	}

	void join(int x, int y) {
		x = find(x), y = find(y);
		if(x == y) {
			if(bicomp == -1) bicomp = x;
			else bicomp = -2;
			return;
		}
		rep[x] += rep[y];
		rep[y] = x;
	}

	int max_deg = 0;
	void add_edge(int a, int b) {
		if(a == excluded || b == excluded)
			return;
		max_deg = max(max_deg, ++deg[a]);
		max_deg = max(max_deg, ++deg[b]);
		join(a, b);
	}

	Graph(int n = 0, int e = -1) : rep(n, -1), deg(n), excluded(e) {}
};

int n;
vector<pair<int, int>> edges;
Graph graph;
vector<Graph> without;

void Init(int N) {
	n = N;
	graph = Graph(n);
}

void Link(int A, int B) {
	edges.emplace_back(A, B);
	if(graph.max_deg < 3) {
		graph.add_edge(A, B);
		if(graph.max_deg == 3) {
			if(graph.deg[A] != 3)
				swap(A, B);

			vector<int> crit = {A};
			for(auto &[u, v] : edges) {
				if(u == A) crit.emplace_back(v);
				if(v == A) crit.emplace_back(u);
			}

			for(int x : crit) {
				without.emplace_back(n, x);
				for(auto &[u, v] : edges)
					without.back().add_edge(v, u);		
			}
		}
	}
	else {
		for(auto &g : without)
			g.add_edge(A, B);
	}
}

int CountCritical() {
	if(graph.max_deg < 3) {
		if(graph.bicomp == -1) return n;
		if(graph.bicomp == -2) return 0;
		return graph.get_cycle();
	}
	else {
		int ret = 0;
		for(auto &g : without) {
			if(g.bicomp == -1 && g.max_deg < 3)
				ret++;
		}
		return ret;
	}
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 6 ms 512 KB Output is correct
3 Correct 6 ms 640 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 6 ms 512 KB Output is correct
7 Correct 5 ms 512 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 6 ms 640 KB Output is correct
10 Correct 6 ms 640 KB Output is correct

Subtask #2
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 198 ms 8988 KB Output is correct
2 Correct 642 ms 40040 KB Output is correct
3 Execution timed out 4075 ms 47964 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 6 ms 512 KB Output is correct
3 Correct 6 ms 640 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 6 ms 512 KB Output is correct
7 Correct 5 ms 512 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 6 ms 640 KB Output is correct
10 Correct 6 ms 640 KB Output is correct
11 Correct 6 ms 640 KB Output is correct
12 Correct 9 ms 896 KB Output is correct
13 Correct 10 ms 896 KB Output is correct
14 Correct 41 ms 896 KB Output is correct
15 Correct 74 ms 1280 KB Output is correct
16 Correct 7 ms 640 KB Output is correct
17 Correct 9 ms 1024 KB Output is correct
18 Correct 9 ms 1408 KB Output is correct
19 Correct 8 ms 640 KB Output is correct
20 Correct 8 ms 896 KB Output is correct

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 6 ms 512 KB Output is correct
3 Correct 6 ms 640 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 6 ms 512 KB Output is correct
7 Correct 5 ms 512 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 6 ms 640 KB Output is correct
10 Correct 6 ms 640 KB Output is correct
11 Correct 6 ms 640 KB Output is correct
12 Correct 9 ms 896 KB Output is correct
13 Correct 10 ms 896 KB Output is correct
14 Correct 41 ms 896 KB Output is correct
15 Correct 74 ms 1280 KB Output is correct
16 Correct 7 ms 640 KB Output is correct
17 Correct 9 ms 1024 KB Output is correct
18 Correct 9 ms 1408 KB Output is correct
19 Correct 8 ms 640 KB Output is correct
20 Correct 8 ms 896 KB Output is correct
21 Correct 18 ms 1280 KB Output is correct
22 Correct 27 ms 1784 KB Output is correct
23 Correct 34 ms 2164 KB Output is correct
24 Execution timed out 4081 ms 5084 KB Time limit exceeded
25 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 6 ms 512 KB Output is correct
3 Correct 6 ms 640 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 6 ms 512 KB Output is correct
7 Correct 5 ms 512 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 6 ms 640 KB Output is correct
10 Correct 6 ms 640 KB Output is correct
11 Correct 198 ms 8988 KB Output is correct
12 Correct 642 ms 40040 KB Output is correct
13 Execution timed out 4075 ms 47964 KB Time limit exceeded
14 Halted 0 ms 0 KB -