oj.uz

Submission #317465

# Submission time Handle Problem Language Result Execution time Memory
317465 2020-10-29T18:18:11 Z mohamedsobhi777 Parachute rings (IOI12_rings) C++14
37 / 100
 1970 ms 104300 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);

        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;

        for (int j = 0; j < N; ++j)
        {
                ++c;
                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()];
        }
        int ans1 = 0;
        if (th.size() == 1)
        {
                if (asy)
                        return 1 + (int)adj[*th.begin()].size();
                ++c;
                set<int> anss;
                int a = (*th.begin());
                if (check(a))
                {
                        anss.insert(a);
                }
                for (auto u : adj[a])
                {
                        ++c;
                        if (check(u))
                                anss.insert(u);
                }
                ans1 = (int)anss.size();
                //                return (int)anss.size();
        }
        else if (th.size() == 2)
        {

                int a = *th.begin();
                int b = *th.rbegin();
                if (cs)
                {
                        if (onc[a] + onc[b] == 0)
                                return 0;
                }
                map<int, int> mp;
                for (auto u : adj[a])
                        mp[u]++;
                for (auto u : adj[b])
                        mp[u]++;
                mp[a]++;
                mp[b]++;
                for (auto u : mp)
                {
                        if ((onc[u.first] || !cs) && u.second == 2)
                                ++ret;
                }
                return ret;
        }
        set<int> ass;
        if (th.size() == 0)
                return N;
        else
        {
                for (auto u : adj[*th.begin()])
                        ass.insert(u);
                ass.insert(*th.begin());
        }

        for (auto i : ass)
        {
                ++c;
                if (check(i))
                {
                        if (th.size())
                                assert(ass.find(i) != ass.end());
                        ++ret;
                }
        }
        if (th.size())
        {
                assert(ret == ans1);
        }
        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 18 ms 27776 KB Output is correct
2 Correct 20 ms 27904 KB Output is correct
3 Correct 23 ms 27904 KB Output is correct
4 Correct 19 ms 27776 KB Output is correct
5 Correct 20 ms 28032 KB Output is correct
6 Correct 22 ms 28288 KB Output is correct
7 Correct 19 ms 27776 KB Output is correct
8 Correct 21 ms 27904 KB Output is correct
9 Correct 22 ms 27936 KB Output is correct
10 Correct 21 ms 27904 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 499 ms 46324 KB Output is correct
2 Correct 971 ms 56184 KB Output is correct
3 Correct 1970 ms 79440 KB Output is correct
4 Correct 1231 ms 66040 KB Output is correct
5 Correct 1255 ms 72276 KB Output is correct
6 Correct 1344 ms 104300 KB Output is correct
7 Correct 1838 ms 80692 KB Output is correct
8 Correct 1151 ms 60868 KB Output is correct
9 Correct 1235 ms 62992 KB Output is correct
10 Correct 831 ms 65476 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 27776 KB Output is correct
2 Correct 20 ms 27904 KB Output is correct
3 Correct 23 ms 27904 KB Output is correct
4 Correct 19 ms 27776 KB Output is correct
5 Correct 20 ms 28032 KB Output is correct
6 Correct 22 ms 28288 KB Output is correct
7 Correct 19 ms 27776 KB Output is correct
8 Correct 21 ms 27904 KB Output is correct
9 Correct 22 ms 27936 KB Output is correct
10 Correct 21 ms 27904 KB Output is correct
11 Incorrect 187 ms 28012 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 27776 KB Output is correct
2 Correct 20 ms 27904 KB Output is correct
3 Correct 23 ms 27904 KB Output is correct
4 Correct 19 ms 27776 KB Output is correct
5 Correct 20 ms 28032 KB Output is correct
6 Correct 22 ms 28288 KB Output is correct
7 Correct 19 ms 27776 KB Output is correct
8 Correct 21 ms 27904 KB Output is correct
9 Correct 22 ms 27936 KB Output is correct
10 Correct 21 ms 27904 KB Output is correct
11 Incorrect 187 ms 28012 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 27776 KB Output is correct
2 Correct 20 ms 27904 KB Output is correct
3 Correct 23 ms 27904 KB Output is correct
4 Correct 19 ms 27776 KB Output is correct
5 Correct 20 ms 28032 KB Output is correct
6 Correct 22 ms 28288 KB Output is correct
7 Correct 19 ms 27776 KB Output is correct
8 Correct 21 ms 27904 KB Output is correct
9 Correct 22 ms 27936 KB Output is correct
10 Correct 21 ms 27904 KB Output is correct
11 Correct 499 ms 46324 KB Output is correct
12 Correct 971 ms 56184 KB Output is correct
13 Correct 1970 ms 79440 KB Output is correct
14 Correct 1231 ms 66040 KB Output is correct
15 Correct 1255 ms 72276 KB Output is correct
16 Correct 1344 ms 104300 KB Output is correct
17 Correct 1838 ms 80692 KB Output is correct
18 Correct 1151 ms 60868 KB Output is correct
19 Correct 1235 ms 62992 KB Output is correct
20 Correct 831 ms 65476 KB Output is correct
21 Incorrect 187 ms 28012 KB Output isn't correct
22 Halted 0 ms 0 KB -