oj.uz

Submission #317485

# Submission time Handle Problem Language Result Execution time Memory
317485 2020-10-29T18:50:44 Z mohamedsobhi777 Parachute rings (IOI12_rings) C++14
37 / 100
 1343 ms 104272 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;
vector<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;
}
vector<int> bigs;
vector<int> cyc;
vector<int> now;
int onc[cn];

bool check(int i)
{
        del = i;
        for (auto u : adj[i])
        {
                deg[u]--;
                deg[i]--;
        }
        bool ok = 1;
        ++c;
        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;
}

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 4;
        }
        int ans1 = 0;
        if (th.size() == 1)
        {
                if (asy)
                      return 1 + (int)adj[*th.begin()].size();
                ++c;
                int a = *th.begin();
                if (cs == 1)
                {
                        ans1 = onc[a];
                        for (auto u : adj[a])
                                ans1 += onc[u];
                        return ans1;
                }

                //                return (int)anss.size();
        }
        else if (th.size() == 2)
        {

                int a = th[0];
                int b = th[1];
                if (cs)
                {
                        if (onc[a] + onc[b] == 0)
                                return 0;
                }
                unordered_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;
        }
        if (th.size() == 0)
                return N;

        ret = 0;
        for (int i = 0; i < N; ++i)
        {
                ret += check(i);
        }
        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] == 4)
                bigs.push_back(A);
        if (deg[B] == 4)
                bigs.push_back(B);
        if (deg[A] == 3)
        {
                th.push_back(A);
        }
        if (deg[B] == 3)
        {
                th.push_back(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 17 ms 27776 KB Output is correct
2 Correct 20 ms 27904 KB Output is correct
3 Correct 21 ms 28032 KB Output is correct
4 Correct 19 ms 27776 KB Output is correct
5 Correct 20 ms 28032 KB Output is correct
6 Correct 21 ms 28288 KB Output is correct
7 Correct 18 ms 27776 KB Output is correct
8 Correct 19 ms 27904 KB Output is correct
9 Correct 21 ms 27904 KB Output is correct
10 Correct 20 ms 27904 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 482 ms 46064 KB Output is correct
2 Correct 981 ms 56184 KB Output is correct
3 Correct 1246 ms 62056 KB Output is correct
4 Correct 1219 ms 66044 KB Output is correct
5 Correct 1248 ms 72356 KB Output is correct
6 Correct 1343 ms 104272 KB Output is correct
7 Correct 1222 ms 65132 KB Output is correct
8 Correct 1168 ms 60864 KB Output is correct
9 Correct 1233 ms 63072 KB Output is correct
10 Correct 819 ms 65376 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 27776 KB Output is correct
2 Correct 20 ms 27904 KB Output is correct
3 Correct 21 ms 28032 KB Output is correct
4 Correct 19 ms 27776 KB Output is correct
5 Correct 20 ms 28032 KB Output is correct
6 Correct 21 ms 28288 KB Output is correct
7 Correct 18 ms 27776 KB Output is correct
8 Correct 19 ms 27904 KB Output is correct
9 Correct 21 ms 27904 KB Output is correct
10 Correct 20 ms 27904 KB Output is correct
11 Incorrect 20 ms 28032 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 27776 KB Output is correct
2 Correct 20 ms 27904 KB Output is correct
3 Correct 21 ms 28032 KB Output is correct
4 Correct 19 ms 27776 KB Output is correct
5 Correct 20 ms 28032 KB Output is correct
6 Correct 21 ms 28288 KB Output is correct
7 Correct 18 ms 27776 KB Output is correct
8 Correct 19 ms 27904 KB Output is correct
9 Correct 21 ms 27904 KB Output is correct
10 Correct 20 ms 27904 KB Output is correct
11 Incorrect 20 ms 28032 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 27776 KB Output is correct
2 Correct 20 ms 27904 KB Output is correct
3 Correct 21 ms 28032 KB Output is correct
4 Correct 19 ms 27776 KB Output is correct
5 Correct 20 ms 28032 KB Output is correct
6 Correct 21 ms 28288 KB Output is correct
7 Correct 18 ms 27776 KB Output is correct
8 Correct 19 ms 27904 KB Output is correct
9 Correct 21 ms 27904 KB Output is correct
10 Correct 20 ms 27904 KB Output is correct
11 Correct 482 ms 46064 KB Output is correct
12 Correct 981 ms 56184 KB Output is correct
13 Correct 1246 ms 62056 KB Output is correct
14 Correct 1219 ms 66044 KB Output is correct
15 Correct 1248 ms 72356 KB Output is correct
16 Correct 1343 ms 104272 KB Output is correct
17 Correct 1222 ms 65132 KB Output is correct
18 Correct 1168 ms 60864 KB Output is correct
19 Correct 1233 ms 63072 KB Output is correct
20 Correct 819 ms 65376 KB Output is correct
21 Incorrect 20 ms 28032 KB Output isn't correct
22 Halted 0 ms 0 KB -