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Submission #317418

# Submission time Handle Problem Language Result Execution time Memory
317418 2020-10-29T17:19:40 Z mohamedsobhi777 Parachute rings (IOI12_rings) C++14
20 / 100
 4000 ms 113336 KB 
#include <bits/stdc++.h>

using namespace std;
int N;
const int cn = 1e6;

vector<int> adj[cn];
int deg[cn];
int vis[cn];
int c;
bool bd = 1;
int del;
vector<int> vec;
set<int> th;
int asy = 1;
int cs = 0;

struct dsu
{
        int fat[cn];
        dsu()
        {
                memset(fat, 0, sizeof fat);
                for (int i = 0; i < cn; ++i)
                        fat[i] = i;
        }
        inline int find(int x) { return fat[x] = (x == fat[x] ? x : find(fat[x])); }
        inline bool same(int x, int y) { return find(x) == find(y); }
        void link(int u, int v)
        {
                u = find(u);
                v = find(v);
                if (fat[u] != v)
                        fat[u] = v;
        }
} d1;

void dfs(int x, int p)
{
        vis[x] = c;
        int ch = (p != x);
        vec.push_back(x);
        for (auto u : adj[x])
        {
                if (u == p || del == u)
                        continue;
                if (vis[u] == c)
                        bd = 0;
                else
                        dfs(u, x), ++ch;
        }
        if (ch > 2)
                bd = 0;
}
set<int> bigs;

bool check(int i)
{
        del = i;
        for (auto u : adj[i])
        {
                deg[u]--;
                deg[i]--;
        }
        bool ok = 1;
        vec.clear();
        for (int j = 0; j < N; ++j)
        {
                if (vis[j] != c && i != j)
                {
                        bd = 1;
                        dfs(j, j);
                        ok &= bd;
                }
        }

        for (auto u : adj[i])
        {
                deg[u]++;
                deg[i]++;
        }
        return ok;
}

vector<int> cyc;
vector<int> now;

void detect(int x, int p)
{
        if (vis[x] == c)
        {
                cyc = now;
                return;
        }
        now.push_back(x);

        vis[x] = c;
        for (auto u : adj[x])
        {
                if (u == p || (int)cyc.size())
                        continue;
                detect(u, x);
        }
        now.pop_back();
}

int brute()
{
        int ret = 0;
        set<int> uni;
        if (th.size() > 2)
                return 0;
        if (bigs.size() > 1)
                return 0;
        if (bigs.size() == 1 && asy)
                return 1;
        if (th.size() == 1 && bigs.size() == 0 && asy)
        {
                return 1 + (int)adj[*th.begin()].size();
        }

        if (cyc.size() && cs == 1 && th.size() == 0)
        {
                return (int)cyc.size();
        }
        if (cs == 2)
        {
                return 0;
        }
        if (asy && th.size() == 0)
                return N;

        if (th.size() > 1)
        {

                for (auto u : th)
                {
                        ++c;
                        if (check(u))
                                uni.insert(u);
                        for (auto v : adj[u])
                        {
                                ++c;
                                if (check(v))
                                        uni.insert(v);
                        }
                }
                for (auto u : bigs)
                {
                        ++c;
                        if (check(u))
                                uni.insert(u);
                }
                return (int)uni.size();
        }
        // if (asy)
        //       return N;
        for (int i = 0; i < N; ++i)
        {
                ++c;
                if (check(i))
                        ++ret;
        }

        return ret;
}

void Init(int N_)
{

        N = N_;
}
void Link(int A, int B)
{
        adj[A].push_back(B);
        adj[B].push_back(A);
        cs += (d1.same(A, B));
        if (d1.same(A, B) && asy)
        {
                ++c;
                detect(A, A);
                asy = 0;
        }

        d1.link(A, B);
        deg[A]++;
        deg[B]++;
        if (deg[A] > 3)
                bigs.insert(A);
        if (deg[B] > 3)
                bigs.insert(B);
        if (deg[A] == 3)
        {
                th.insert(A);
        }
        if (deg[B] == 3)
        {
                th.insert(B);
        }
}

int CountCritical()
{
        if (bigs.size() > 1)
                return 0;
        return brute();
        return N;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 27776 KB Output is correct
2 Correct 22 ms 27904 KB Output is correct
3 Correct 24 ms 28024 KB Output is correct
4 Correct 20 ms 27776 KB Output is correct
5 Correct 21 ms 28032 KB Output is correct
6 Correct 24 ms 28160 KB Output is correct
7 Correct 20 ms 27776 KB Output is correct
8 Correct 406 ms 28152 KB Output is correct
9 Correct 24 ms 28032 KB Output is correct
10 Correct 24 ms 28032 KB Output is correct

Subtask #2
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 509 ms 46076 KB Output is correct
2 Correct 1010 ms 55928 KB Output is correct
3 Correct 2028 ms 92152 KB Output is correct
4 Correct 1238 ms 78048 KB Output is correct
5 Correct 1259 ms 82140 KB Output is correct
6 Correct 1362 ms 113336 KB Output is correct
7 Correct 1842 ms 92392 KB Output is correct
8 Correct 3077 ms 81668 KB Output is correct
9 Correct 3344 ms 85508 KB Output is correct
10 Execution timed out 4033 ms 86872 KB Time limit exceeded

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 27776 KB Output is correct
2 Correct 22 ms 27904 KB Output is correct
3 Correct 24 ms 28024 KB Output is correct
4 Correct 20 ms 27776 KB Output is correct
5 Correct 21 ms 28032 KB Output is correct
6 Correct 24 ms 28160 KB Output is correct
7 Correct 20 ms 27776 KB Output is correct
8 Correct 406 ms 28152 KB Output is correct
9 Correct 24 ms 28032 KB Output is correct
10 Correct 24 ms 28032 KB Output is correct
11 Execution timed out 4037 ms 28020 KB Time limit exceeded
12 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 27776 KB Output is correct
2 Correct 22 ms 27904 KB Output is correct
3 Correct 24 ms 28024 KB Output is correct
4 Correct 20 ms 27776 KB Output is correct
5 Correct 21 ms 28032 KB Output is correct
6 Correct 24 ms 28160 KB Output is correct
7 Correct 20 ms 27776 KB Output is correct
8 Correct 406 ms 28152 KB Output is correct
9 Correct 24 ms 28032 KB Output is correct
10 Correct 24 ms 28032 KB Output is correct
11 Execution timed out 4037 ms 28020 KB Time limit exceeded
12 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 27776 KB Output is correct
2 Correct 22 ms 27904 KB Output is correct
3 Correct 24 ms 28024 KB Output is correct
4 Correct 20 ms 27776 KB Output is correct
5 Correct 21 ms 28032 KB Output is correct
6 Correct 24 ms 28160 KB Output is correct
7 Correct 20 ms 27776 KB Output is correct
8 Correct 406 ms 28152 KB Output is correct
9 Correct 24 ms 28032 KB Output is correct
10 Correct 24 ms 28032 KB Output is correct
11 Correct 509 ms 46076 KB Output is correct
12 Correct 1010 ms 55928 KB Output is correct
13 Correct 2028 ms 92152 KB Output is correct
14 Correct 1238 ms 78048 KB Output is correct
15 Correct 1259 ms 82140 KB Output is correct
16 Correct 1362 ms 113336 KB Output is correct
17 Correct 1842 ms 92392 KB Output is correct
18 Correct 3077 ms 81668 KB Output is correct
19 Correct 3344 ms 85508 KB Output is correct
20 Execution timed out 4033 ms 86872 KB Time limit exceeded