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Submission #317481

# Submission time Handle Problem Language Result Execution time Memory
317481 2020-10-29T18:41:59 Z mohamedsobhi777 Parachute rings (IOI12_rings) C++14
37 / 100
 4000 ms 104440 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;
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 onc[*bigs.begin()];
        }
        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.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());*/
        }
        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] > 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 19 ms 27776 KB Output is correct
2 Correct 21 ms 27904 KB Output is correct
3 Correct 21 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 21 ms 28288 KB Output is correct
7 Correct 19 ms 27776 KB Output is correct
8 Correct 20 ms 27904 KB Output is correct
9 Correct 22 ms 27904 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 483 ms 46176 KB Output is correct
2 Correct 960 ms 55972 KB Output is correct
3 Correct 1893 ms 79608 KB Output is correct
4 Correct 1225 ms 66020 KB Output is correct
5 Correct 1233 ms 72184 KB Output is correct
6 Correct 1334 ms 104440 KB Output is correct
7 Correct 1740 ms 80632 KB Output is correct
8 Correct 1127 ms 60900 KB Output is correct
9 Correct 1226 ms 62968 KB Output is correct
10 Correct 823 ms 65504 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 27776 KB Output is correct
2 Correct 21 ms 27904 KB Output is correct
3 Correct 21 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 21 ms 28288 KB Output is correct
7 Correct 19 ms 27776 KB Output is correct
8 Correct 20 ms 27904 KB Output is correct
9 Correct 22 ms 27904 KB Output is correct
10 Correct 21 ms 27904 KB Output is correct
11 Execution timed out 4038 ms 28068 KB Time limit exceeded
12 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 27776 KB Output is correct
2 Correct 21 ms 27904 KB Output is correct
3 Correct 21 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 21 ms 28288 KB Output is correct
7 Correct 19 ms 27776 KB Output is correct
8 Correct 20 ms 27904 KB Output is correct
9 Correct 22 ms 27904 KB Output is correct
10 Correct 21 ms 27904 KB Output is correct
11 Execution timed out 4038 ms 28068 KB Time limit exceeded
12 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 27776 KB Output is correct
2 Correct 21 ms 27904 KB Output is correct
3 Correct 21 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 21 ms 28288 KB Output is correct
7 Correct 19 ms 27776 KB Output is correct
8 Correct 20 ms 27904 KB Output is correct
9 Correct 22 ms 27904 KB Output is correct
10 Correct 21 ms 27904 KB Output is correct
11 Correct 483 ms 46176 KB Output is correct
12 Correct 960 ms 55972 KB Output is correct
13 Correct 1893 ms 79608 KB Output is correct
14 Correct 1225 ms 66020 KB Output is correct
15 Correct 1233 ms 72184 KB Output is correct
16 Correct 1334 ms 104440 KB Output is correct
17 Correct 1740 ms 80632 KB Output is correct
18 Correct 1127 ms 60900 KB Output is correct
19 Correct 1226 ms 62968 KB Output is correct
20 Correct 823 ms 65504 KB Output is correct
21 Execution timed out 4038 ms 28068 KB Time limit exceeded
22 Halted 0 ms 0 KB -