oj.uz

Submission #317433

# Submission time Handle Problem Language Result Execution time Memory
317433 2020-10-29T17:45:14 Z mohamedsobhi777 Parachute rings (IOI12_rings) C++14
0 / 100
 2016 ms 104188 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;
int onc[cn];

void detect(int x, int p)
{
        if (vis[x] == c)
        {
                cyc = now;
                for (auto u : now)
                        onc[u] = 1;
                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())
        {
                if (asy)
                        return 1;
                return onc[*bigs.begin()];
        }

        if (th.size() == 1)
        {
                if (asy)
                        return 1 + (int)adj[*th.begin()].size();
                int tret = onc[*th.begin()];
                for (auto u : adj[*th.begin()])
                        tret += onc[u];
                //return tret;
        }
        else if (th.size() == 2)
        {
                int a = *th.begin();
                int b = *th.rbegin();
                if (onc[a] + onc[b] == 0)
                        return 0;
        }

        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 (th.size() == 0)
                return N;

        // 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
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 27776 KB Output is correct
2 Correct 21 ms 27904 KB Output is correct
3 Correct 22 ms 27904 KB Output is correct
4 Correct 22 ms 27776 KB Output is correct
5 Correct 37 ms 28008 KB Output is correct
6 Correct 21 ms 28264 KB Output is correct
7 Correct 20 ms 27776 KB Output is correct
8 Correct 21 ms 27904 KB Output is correct
9 Incorrect 21 ms 27904 KB Output isn't correct
10 Halted 0 ms 0 KB -

Subtask #2
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 521 ms 46120 KB Output is correct
2 Correct 1014 ms 56056 KB Output is correct
3 Correct 2016 ms 79608 KB Output is correct
4 Correct 1308 ms 66068 KB Output is correct
5 Correct 1251 ms 72184 KB Output is correct
6 Correct 1452 ms 104188 KB Output is correct
7 Correct 1907 ms 80344 KB Output is correct
8 Incorrect 1184 ms 60896 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 27776 KB Output is correct
2 Correct 21 ms 27904 KB Output is correct
3 Correct 22 ms 27904 KB Output is correct
4 Correct 22 ms 27776 KB Output is correct
5 Correct 37 ms 28008 KB Output is correct
6 Correct 21 ms 28264 KB Output is correct
7 Correct 20 ms 27776 KB Output is correct
8 Correct 21 ms 27904 KB Output is correct
9 Incorrect 21 ms 27904 KB Output isn't correct
10 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 21 ms 27904 KB Output is correct
3 Correct 22 ms 27904 KB Output is correct
4 Correct 22 ms 27776 KB Output is correct
5 Correct 37 ms 28008 KB Output is correct
6 Correct 21 ms 28264 KB Output is correct
7 Correct 20 ms 27776 KB Output is correct
8 Correct 21 ms 27904 KB Output is correct
9 Incorrect 21 ms 27904 KB Output isn't correct
10 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 21 ms 27904 KB Output is correct
3 Correct 22 ms 27904 KB Output is correct
4 Correct 22 ms 27776 KB Output is correct
5 Correct 37 ms 28008 KB Output is correct
6 Correct 21 ms 28264 KB Output is correct
7 Correct 20 ms 27776 KB Output is correct
8 Correct 21 ms 27904 KB Output is correct
9 Incorrect 21 ms 27904 KB Output isn't correct
10 Halted 0 ms 0 KB -