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Submission #255714

# Submission time Handle Problem Language Result Execution time Memory
255714 2020-08-01T16:09:09 Z Akashi Parachute rings (IOI12_rings) C++14
55 / 100
 4000 ms 79052 KB 
//#include "rings.h"
#include <bits/stdc++.h>
using namespace std;

const int DIM = 1e6;

int ans;
int tip; /// 0 daca nu am restrictii, 1 daca am un ciclu simplu, 2 daca deja am putini candidati
int which; ///ce lant e ciclu simplu
int r1, r2; ///lanturile pe care am nodurile critice
int n;
int gr[DIM], Front[DIM], Back[DIM];

int ind = 1;
int tt[DIM], sz[DIM];
vector <int> cand;
vector <int> adj[DIM];

void Init(int N_) {
    n = N_; ans = n; tip = 0;

    for (int i = 0; i < n ; ++i) {
        tt[i] = i, sz[i] = 1;
        Front[i] = Back[i] = i;
    }
}

int find(int nod) {
    if (nod != tt[nod]) return (tt[nod] = find(tt[nod]));
    return nod;
}

void get_cand(int A, vector <int> &cand) {
    if (gr[A] >= 4) cand.push_back(A);
    else if (gr[A] == 3) {
        cand.push_back(A);
        for (auto it : adj[A]) cand.push_back(it);
    }
}

void unite(vector <int> &cand, vector <int> candA, vector <int> candB) {
    cand.clear();

    if (candA.empty()) cand = candB;
    else if (candB.empty()) cand = candA;
    else {
        for (auto itA : candA)
            for (auto itB : candB)
                if (itA == itB) {cand.push_back(itA); break ;}
    }
}

int viz[DIM];
bool ign[DIM], mark[DIM];
bool check(int nod, int papa = -1) {
    viz[nod] = ind;

    for (auto it : adj[nod]) {
        if (ign[it]) continue ;
        if (it == papa) continue ;
        if (viz[it] == ind) return false;

        check(it, nod);
    }

    return true;
}

bool change;
void f(int A, int B, int rA, int rB) {
    mark[rA] = mark[rB] = 1;
    if (tip == 0) {
        tip = 2;
        vector <int> candB;

        get_cand(A, cand);
        get_cand(B, candB);
        unite(cand, cand, candB);
    }
    else if (tip == 2) {
        if (cand.size() == 1 && (cand[0] == A || cand[0] == B)) ;
        else change = true;
        vector <int> candA, candB;

        get_cand(A, candA);
        get_cand(B, candB);

        unite(candA, candA, candB);
        unite(cand, cand, candA);
    }
    else if (tip == 1) {
        if (find(which) == rB) swap(A, B), swap(rA, rB);

        if (find(which) == rA) {
            tip = 2;
            vector <int> candB;

            get_cand(A, cand);
            get_cand(B, candB);
            unite(cand, cand, candB);

            vector <int> candA;
            for (auto it : cand)
                if (find(it) == rA) candA.push_back(it);

            cand.clear();
            cand = candA;

        } else cand.clear();
    }

    ans = cand.size();
}

void Link(int A, int B) {
    if (ans == 0) return ;

    ++gr[A]; ++gr[B];
    adj[A].push_back(B);
    adj[B].push_back(A);

    int rA = find(A), rB = find(B);

    if (rA == rB) {
        if (gr[A] == gr[B] && gr[A] == 2) {
            ///am creat un ciclu simplu
            if (tip == 0) {
                tip = 1;
                which = find(A);
                ans = sz[rA];
                mark[rA] = 1;
            } else if (tip == 1) {
                ans = 0;
                return ;
            } else {
                vector <int> candA;
                for (auto it : cand)
                    if (find(it) == rA) candA.push_back(it);

                cand.clear();
                cand = candA;
            }
        } else {
            ///am creat (cel putin) un nod de grad 3
            f(A, B, rA, rB);
        }

    } else {
        ///TODO : sa am grija cand unesc 2 lanturi pe care le-am 'legat' deja la mijloc
        if (!(mark[rA] || mark[rB]) && gr[A] <= 2 && gr[B] <= 2 && (A == Back[rA] || A == Front[rA]) && (B == Back[rB] || B == Front[rB])) {
            ///cazul lejer in care unesc 2 lanturi
            if (sz[rA] < sz[rB]) swap(A, B), swap(rA, rB);
            sz[rA] += sz[rB]; tt[rB] = rA;

            if (A == Back[rA] && B == Front[rB]) Back[rA] = Back[rB];
            else if (A == Back[rA] && B == Back[rB]) Back[rA] = Front[rB];
            else if (B == Front[rB]) Front[rA] = Back[rB];
            else Front[rA] = Front[rB];
        } else {
            ///cazul mai naspa in care unesc 2 lanturi
            f(A, B, rA, rB);
        }
    }
}

int CountCritical() {
    if (change) {
        vector <int> candA;
        for (auto it : cand) {
            ign[it] = 1;

            ++ind;
            bool ok = true;
            for (auto x : adj[it]) {
                if (viz[x] == ind) continue ;
                ok = check(x);
                if (!ok) break ;
            }

            if (ok) candA.push_back(it);
            ign[it] = 0;
        }

        cand.clear();
        cand = candA;

        ans = cand.size();
    }

    change = false;
    return ans;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 23808 KB Output is correct
2 Correct 17 ms 24064 KB Output is correct
3 Correct 17 ms 24192 KB Output is correct
4 Correct 15 ms 23936 KB Output is correct
5 Correct 16 ms 24064 KB Output is correct
6 Correct 17 ms 24140 KB Output is correct
7 Correct 15 ms 23936 KB Output is correct
8 Correct 17 ms 24064 KB Output is correct
9 Correct 18 ms 24192 KB Output is correct
10 Correct 18 ms 24192 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 519 ms 50296 KB Output is correct
2 Correct 1014 ms 68320 KB Output is correct
3 Correct 348 ms 44024 KB Output is correct
4 Correct 1303 ms 74616 KB Output is correct
5 Correct 1303 ms 74720 KB Output is correct
6 Correct 1329 ms 73592 KB Output is correct
7 Correct 350 ms 44024 KB Output is correct
8 Correct 1230 ms 75384 KB Output is correct
9 Correct 1341 ms 79052 KB Output is correct
10 Correct 895 ms 73056 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 23808 KB Output is correct
2 Correct 17 ms 24064 KB Output is correct
3 Correct 17 ms 24192 KB Output is correct
4 Correct 15 ms 23936 KB Output is correct
5 Correct 16 ms 24064 KB Output is correct
6 Correct 17 ms 24140 KB Output is correct
7 Correct 15 ms 23936 KB Output is correct
8 Correct 17 ms 24064 KB Output is correct
9 Correct 18 ms 24192 KB Output is correct
10 Correct 18 ms 24192 KB Output is correct
11 Correct 17 ms 24192 KB Output is correct
12 Correct 21 ms 24448 KB Output is correct
13 Correct 19 ms 24448 KB Output is correct
14 Correct 24 ms 24320 KB Output is correct
15 Correct 25 ms 24576 KB Output is correct
16 Correct 20 ms 24448 KB Output is correct
17 Correct 18 ms 24064 KB Output is correct
18 Correct 19 ms 24320 KB Output is correct
19 Correct 19 ms 24448 KB Output is correct
20 Correct 20 ms 24448 KB Output is correct

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 23808 KB Output is correct
2 Correct 17 ms 24064 KB Output is correct
3 Correct 17 ms 24192 KB Output is correct
4 Correct 15 ms 23936 KB Output is correct
5 Correct 16 ms 24064 KB Output is correct
6 Correct 17 ms 24140 KB Output is correct
7 Correct 15 ms 23936 KB Output is correct
8 Correct 17 ms 24064 KB Output is correct
9 Correct 18 ms 24192 KB Output is correct
10 Correct 18 ms 24192 KB Output is correct
11 Correct 17 ms 24192 KB Output is correct
12 Correct 21 ms 24448 KB Output is correct
13 Correct 19 ms 24448 KB Output is correct
14 Correct 24 ms 24320 KB Output is correct
15 Correct 25 ms 24576 KB Output is correct
16 Correct 20 ms 24448 KB Output is correct
17 Correct 18 ms 24064 KB Output is correct
18 Correct 19 ms 24320 KB Output is correct
19 Correct 19 ms 24448 KB Output is correct
20 Correct 20 ms 24448 KB Output is correct
21 Correct 35 ms 25848 KB Output is correct
22 Correct 49 ms 27000 KB Output is correct
23 Correct 57 ms 27896 KB Output is correct
24 Execution timed out 4062 ms 27892 KB Time limit exceeded
25 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 23808 KB Output is correct
2 Correct 17 ms 24064 KB Output is correct
3 Correct 17 ms 24192 KB Output is correct
4 Correct 15 ms 23936 KB Output is correct
5 Correct 16 ms 24064 KB Output is correct
6 Correct 17 ms 24140 KB Output is correct
7 Correct 15 ms 23936 KB Output is correct
8 Correct 17 ms 24064 KB Output is correct
9 Correct 18 ms 24192 KB Output is correct
10 Correct 18 ms 24192 KB Output is correct
11 Correct 519 ms 50296 KB Output is correct
12 Correct 1014 ms 68320 KB Output is correct
13 Correct 348 ms 44024 KB Output is correct
14 Correct 1303 ms 74616 KB Output is correct
15 Correct 1303 ms 74720 KB Output is correct
16 Correct 1329 ms 73592 KB Output is correct
17 Correct 350 ms 44024 KB Output is correct
18 Correct 1230 ms 75384 KB Output is correct
19 Correct 1341 ms 79052 KB Output is correct
20 Correct 895 ms 73056 KB Output is correct
21 Correct 17 ms 24192 KB Output is correct
22 Correct 21 ms 24448 KB Output is correct
23 Correct 19 ms 24448 KB Output is correct
24 Correct 24 ms 24320 KB Output is correct
25 Correct 25 ms 24576 KB Output is correct
26 Correct 20 ms 24448 KB Output is correct
27 Correct 18 ms 24064 KB Output is correct
28 Correct 19 ms 24320 KB Output is correct
29 Correct 19 ms 24448 KB Output is correct
30 Correct 20 ms 24448 KB Output is correct
31 Correct 35 ms 25848 KB Output is correct
32 Correct 49 ms 27000 KB Output is correct
33 Correct 57 ms 27896 KB Output is correct
34 Execution timed out 4062 ms 27892 KB Time limit exceeded
35 Halted 0 ms 0 KB -