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Submission #317479

# Submission time Handle Problem Language Result Execution time Memory
317479 2020-10-29T18:33:37 Z mohamedsobhi777 Parachute rings (IOI12_rings) C++14
37 / 100
 1969 ms 104172 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;

        for (auto j : cyc)
        {
                ++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;
}

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());
        }
        ret = 0;
        for (auto i : ass)
        {
                if (onc[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;
}

Compilation message

rings.cpp: In function 'int brute()':
rings.cpp:127:13: warning: unused variable 'ans1' [-Wunused-variable]
  127 |         int ans1 = 0;
      |             ^~~~

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 22 ms 28032 KB Output is correct
4 Correct 20 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 20 ms 27776 KB Output is correct
8 Correct 21 ms 27904 KB Output is correct
9 Correct 21 ms 27904 KB Output is correct
10 Correct 22 ms 27904 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 490 ms 46104 KB Output is correct
2 Correct 983 ms 56028 KB Output is correct
3 Correct 1969 ms 79588 KB Output is correct
4 Correct 1250 ms 66072 KB Output is correct
5 Correct 1257 ms 72184 KB Output is correct
6 Correct 1372 ms 104172 KB Output is correct
7 Correct 1811 ms 80504 KB Output is correct
8 Correct 1151 ms 60920 KB Output is correct
9 Correct 1243 ms 63096 KB Output is correct
10 Correct 826 ms 65400 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 22 ms 28032 KB Output is correct
4 Correct 20 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 20 ms 27776 KB Output is correct
8 Correct 21 ms 27904 KB Output is correct
9 Correct 21 ms 27904 KB Output is correct
10 Correct 22 ms 27904 KB Output is correct
11 Incorrect 25 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 19 ms 27776 KB Output is correct
2 Correct 21 ms 27904 KB Output is correct
3 Correct 22 ms 28032 KB Output is correct
4 Correct 20 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 20 ms 27776 KB Output is correct
8 Correct 21 ms 27904 KB Output is correct
9 Correct 21 ms 27904 KB Output is correct
10 Correct 22 ms 27904 KB Output is correct
11 Incorrect 25 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 19 ms 27776 KB Output is correct
2 Correct 21 ms 27904 KB Output is correct
3 Correct 22 ms 28032 KB Output is correct
4 Correct 20 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 20 ms 27776 KB Output is correct
8 Correct 21 ms 27904 KB Output is correct
9 Correct 21 ms 27904 KB Output is correct
10 Correct 22 ms 27904 KB Output is correct
11 Correct 490 ms 46104 KB Output is correct
12 Correct 983 ms 56028 KB Output is correct
13 Correct 1969 ms 79588 KB Output is correct
14 Correct 1250 ms 66072 KB Output is correct
15 Correct 1257 ms 72184 KB Output is correct
16 Correct 1372 ms 104172 KB Output is correct
17 Correct 1811 ms 80504 KB Output is correct
18 Correct 1151 ms 60920 KB Output is correct
19 Correct 1243 ms 63096 KB Output is correct
20 Correct 826 ms 65400 KB Output is correct
21 Incorrect 25 ms 28032 KB Output isn't correct
22 Halted 0 ms 0 KB -