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답안 #317476

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
317476 2020-10-29T18:29:05 Z mohamedsobhi777 낙하산 고리들 (IOI12_rings) C++14
37 / 100
 1911 ms 104248 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)
        {
                if (onc[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;
}

Compilation message

rings.cpp: In function 'int brute()':
rings.cpp:128:13: warning: unused variable 'ans1' [-Wunused-variable]
  128 |         int ans1 = 0;
      |             ^~~~

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 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 25 ms 27904 KB Output is correct
9 Correct 21 ms 27904 KB Output is correct
10 Correct 21 ms 27904 KB Output is correct

Subtask #2
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 526 ms 46272 KB Output is correct
2 Correct 989 ms 56140 KB Output is correct
3 Correct 1911 ms 79644 KB Output is correct
4 Correct 1231 ms 66040 KB Output is correct
5 Correct 1230 ms 72404 KB Output is correct
6 Correct 1342 ms 104248 KB Output is correct
7 Correct 1751 ms 80720 KB Output is correct
8 Correct 1134 ms 60768 KB Output is correct
9 Correct 1180 ms 63132 KB Output is correct
10 Correct 792 ms 65272 KB Output is correct

Subtask #3
0 / 18.0

# 결과 실행 시간 메모리 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 25 ms 27904 KB Output is correct
9 Correct 21 ms 27904 KB Output is correct
10 Correct 21 ms 27904 KB Output is correct
11 Incorrect 21 ms 28032 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# 결과 실행 시간 메모리 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 25 ms 27904 KB Output is correct
9 Correct 21 ms 27904 KB Output is correct
10 Correct 21 ms 27904 KB Output is correct
11 Incorrect 21 ms 28032 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# 결과 실행 시간 메모리 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 25 ms 27904 KB Output is correct
9 Correct 21 ms 27904 KB Output is correct
10 Correct 21 ms 27904 KB Output is correct
11 Correct 526 ms 46272 KB Output is correct
12 Correct 989 ms 56140 KB Output is correct
13 Correct 1911 ms 79644 KB Output is correct
14 Correct 1231 ms 66040 KB Output is correct
15 Correct 1230 ms 72404 KB Output is correct
16 Correct 1342 ms 104248 KB Output is correct
17 Correct 1751 ms 80720 KB Output is correct
18 Correct 1134 ms 60768 KB Output is correct
19 Correct 1180 ms 63132 KB Output is correct
20 Correct 792 ms 65272 KB Output is correct
21 Incorrect 21 ms 28032 KB Output isn't correct
22 Halted 0 ms 0 KB -