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Submission #317426

# Submission time Handle Problem Language Result Execution time Memory
317426 2020-10-29T17:27:02 Z mohamedsobhi777 Parachute rings (IOI12_rings) C++14
37 / 100
 4000 ms 100456 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 (cs > 1 || bigs.size() > 1 || th.size() > 2)
                return 0;
        if (th.size() == 0 && asy)
                return N;
        if (cs == 1 && th.size() == 0)
                return (int)cyc.size();

        if (bigs.size() == 1 && asy)
                return 1;
        if (bigs.size() && !asy)
        {
                if (d1.same(*bigs.begin(), cyc[0]))
                        return 1;
                return 0;
        }
        if (th.size() == 1 && bigs.size() == 0 && asy)
        {
                return 1 + (int)adj[*th.begin()].size();
        }

        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);
                        }
                }
                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 21 ms 27776 KB Output is correct
2 Correct 21 ms 27904 KB Output is correct
3 Correct 22 ms 27896 KB Output is correct
4 Correct 20 ms 27776 KB Output is correct
5 Correct 21 ms 28032 KB Output is correct
6 Correct 22 ms 28160 KB Output is correct
7 Correct 20 ms 27776 KB Output is correct
8 Correct 21 ms 27904 KB Output is correct
9 Correct 23 ms 28032 KB Output is correct
10 Correct 23 ms 28032 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 495 ms 46328 KB Output is correct
2 Correct 948 ms 56088 KB Output is correct
3 Correct 1908 ms 79384 KB Output is correct
4 Correct 1212 ms 64512 KB Output is correct
5 Correct 1220 ms 68228 KB Output is correct
6 Correct 1319 ms 100456 KB Output is correct
7 Correct 1777 ms 80128 KB Output is correct
8 Correct 3073 ms 69132 KB Output is correct
9 Correct 3335 ms 72156 KB Output is correct
10 Correct 820 ms 63480 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 27776 KB Output is correct
2 Correct 21 ms 27904 KB Output is correct
3 Correct 22 ms 27896 KB Output is correct
4 Correct 20 ms 27776 KB Output is correct
5 Correct 21 ms 28032 KB Output is correct
6 Correct 22 ms 28160 KB Output is correct
7 Correct 20 ms 27776 KB Output is correct
8 Correct 21 ms 27904 KB Output is correct
9 Correct 23 ms 28032 KB Output is correct
10 Correct 23 ms 28032 KB Output is correct
11 Execution timed out 4049 ms 28032 KB Time limit exceeded
12 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 27776 KB Output is correct
2 Correct 21 ms 27904 KB Output is correct
3 Correct 22 ms 27896 KB Output is correct
4 Correct 20 ms 27776 KB Output is correct
5 Correct 21 ms 28032 KB Output is correct
6 Correct 22 ms 28160 KB Output is correct
7 Correct 20 ms 27776 KB Output is correct
8 Correct 21 ms 27904 KB Output is correct
9 Correct 23 ms 28032 KB Output is correct
10 Correct 23 ms 28032 KB Output is correct
11 Execution timed out 4049 ms 28032 KB Time limit exceeded
12 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 27776 KB Output is correct
2 Correct 21 ms 27904 KB Output is correct
3 Correct 22 ms 27896 KB Output is correct
4 Correct 20 ms 27776 KB Output is correct
5 Correct 21 ms 28032 KB Output is correct
6 Correct 22 ms 28160 KB Output is correct
7 Correct 20 ms 27776 KB Output is correct
8 Correct 21 ms 27904 KB Output is correct
9 Correct 23 ms 28032 KB Output is correct
10 Correct 23 ms 28032 KB Output is correct
11 Correct 495 ms 46328 KB Output is correct
12 Correct 948 ms 56088 KB Output is correct
13 Correct 1908 ms 79384 KB Output is correct
14 Correct 1212 ms 64512 KB Output is correct
15 Correct 1220 ms 68228 KB Output is correct
16 Correct 1319 ms 100456 KB Output is correct
17 Correct 1777 ms 80128 KB Output is correct
18 Correct 3073 ms 69132 KB Output is correct
19 Correct 3335 ms 72156 KB Output is correct
20 Correct 820 ms 63480 KB Output is correct
21 Execution timed out 4049 ms 28032 KB Time limit exceeded
22 Halted 0 ms 0 KB -