oj.uz

Submission #103804

# Submission time Handle Problem Language Result Execution time Memory
103804 2019-04-02T17:47:05 Z naoai Parachute rings (IOI12_rings) C++14
52 / 100
 4000 ms 223828 KB 
#include <bits/stdc++.h>

using namespace std;

const int nmax = 1e6 + 5;

static int n;
static vector<int> ciclu;
static vector<int> cen, g3, trk;
static vector<int> vec[nmax + 1];

struct Str {
    bool valid;
    int c1[nmax + 1], c2[nmax + 1];
    int grad[nmax + 1], t[nmax + 1];
    int g[nmax + 1];

    void init () {
        valid = 1;
        for (int i = 0; i < n; ++ i) {
            grad[i] = 1;
            t[i] = c1[i] = c2[i] = i;
        }
    }

    inline int find_tata (int x) {
        if (x == t[x]) return x;
        return t[x] = find_tata(t[x]);
    }

    void link (int A, int B, int type = -1) {
        ++ g[A]; ++ g[B];
        if (type == 1) {
            vec[A].push_back(B);
            vec[B].push_back(A);
        }

        if (valid == 0)
            return ;

        if (g[A] < 3 && g[B] < 3) {
            int la = find_tata(A);
            int lb = find_tata(B);

            if (la == lb) { // apare ciclu
                if (type == 1 && (c1[la] == A && c2[la] == B || c1[la] == B && c2[la] == A))
                    c1[la] = c2[la] = -1;
                else
                    valid = 0;
            } else {
                if (grad[la] < grad[lb]) {
                    swap(la, lb);
                    swap(A, B);
                }

                grad[la] += grad[lb];
                t[lb] = la;

                if (A == c1[la]) {
                    c1[la] = c1[lb] + c2[lb] - B;
                } else {
                    c2[la] = c1[lb] + c2[lb] - B;
                }
            }
        } else
            valid = 0;
    }
} root, s3[7];

int centered;

static vector<pair<int, int>> e;
static map<pair<int, int>, bool> mp;

void Init(int N_) {
    n = N_;
    centered = -1;
    root.init();
}

bool nuexista (int i) {
    bool ok = 1;
    for (auto j : trk)
        if (i == j) ok = 0;
    return ok;
}

void invalideaza (int x) {
    for (int i = 0; i < trk.size(); ++ i) {
        if (trk[i] == x) continue;

        bool ok = 0;
        for (auto j : vec[x])
            if (trk[i] == j)
                ok = 1;

        if (ok == 0) {
            s3[i].valid = 0;
        }
    }
}

void Link(int A, int B) {
    e.push_back({A, B});
    mp[{A, B}] = mp[{B, A}] = 1;

    if (root.g[A] == 1 && root.g[B] == 1 && root.find_tata(A) == root.find_tata(B)) {
        ciclu.push_back(root.grad[root.find_tata(A)]);
    }

    root.link(A, B, 1);

    int old3 = trk.size();

    if (cen.size() == 0 && (root.g[A] >= 3 || root.g[B] >= 3)) {
        if (g3.size() > 4)
            return ;

        if (root.g[A] == 3) {
            g3.push_back(A);
            if (nuexista(A))
                trk.push_back(A);
            for (auto i : vec[A]) {
                if (g3.size() == 1)
                    trk.push_back(i);
            }

            invalideaza(A);
        }
        if (root.g[B] == 3) {
            g3.push_back(B);
            if (nuexista(B))
                trk.push_back(B);
            for (auto i : vec[B]) {
                if (g3.size() == 1)
                    trk.push_back(i);
            }

            invalideaza(B);
        }

        if (root.g[A] > 3) cen.push_back(A);
        if (root.g[B] > 3) cen.push_back(B);
    }

    if (centered == -1 && cen.size() == 1 && g3.size() <= 4) {
        for (int i = 0; i < g3.size(); ++ i) {
            if (g3[i] == cen[0])
                centered = i;
        }
    }

    // dc nu exista cen, at tin pentru cele 4 g3 uri cum arata fara fiecare
    if (cen.size() == 0) {
        if (g3.size() > 4)
            return ;

        for (int i = old3; i < (int)trk.size(); ++ i) {
            s3[i].init();

            for (auto j : e)
                if (j.first != trk[i] && j.second != trk[i])
                    s3[i].link(j.first, j.second);
        }

        for (int i = 0; i < old3; ++ i)
            if (A != trk[i] && B != trk[i])
                s3[i].link(A, B);
    }

    if (cen.size() == 1)
        if (A != cen[0] && B != cen[0])
            s3[centered].link(A, B);
}

int CountCritical() {
    if (ciclu.size() > 1 || cen.size() > 1) {
        return 0;
    }

    if (g3.size() == 0) {
        if (ciclu.size() == 0)
            return n;
        return ciclu[0];
    } else {
        if (cen.size() == 0 && g3.size() > 4) // daca sunt 4+ trebuie sa aiba un centru
            return 0;

        if (cen.size()) {
            return s3[centered].valid;
        } else {
            int cnt = 0;
            for (int i = 0; i < (int)trk.size(); ++ i) {
                cnt += s3[i].valid;
            }
            return cnt;
        }
    }
}

Compilation message

rings.cpp: In member function 'void Str::link(int, int, int)':
rings.cpp:46:47: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
                 if (type == 1 && (c1[la] == A && c2[la] == B || c1[la] == B && c2[la] == A))
                                   ~~~~~~~~~~~~^~~~~~~~~~~~~~
rings.cpp: In function 'void invalideaza(int)':
rings.cpp:89:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < trk.size(); ++ i) {
                     ~~^~~~~~~~~~~~
rings.cpp: In function 'void Link(int, int)':
rings.cpp:147:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i < g3.size(); ++ i) {
                         ~~^~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 23808 KB Output is correct
2 Correct 34 ms 25208 KB Output is correct
3 Correct 34 ms 25464 KB Output is correct
4 Correct 24 ms 24064 KB Output is correct
5 Correct 28 ms 24448 KB Output is correct
6 Correct 29 ms 24832 KB Output is correct
7 Correct 24 ms 25088 KB Output is correct
8 Correct 35 ms 24576 KB Output is correct
9 Correct 33 ms 25384 KB Output is correct
10 Correct 34 ms 25532 KB Output is correct

Subtask #2
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 2794 ms 126100 KB Output is correct
2 Execution timed out 4115 ms 223828 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 23808 KB Output is correct
2 Correct 34 ms 25208 KB Output is correct
3 Correct 34 ms 25464 KB Output is correct
4 Correct 24 ms 24064 KB Output is correct
5 Correct 28 ms 24448 KB Output is correct
6 Correct 29 ms 24832 KB Output is correct
7 Correct 24 ms 25088 KB Output is correct
8 Correct 35 ms 24576 KB Output is correct
9 Correct 33 ms 25384 KB Output is correct
10 Correct 34 ms 25532 KB Output is correct
11 Correct 31 ms 25372 KB Output is correct
12 Correct 40 ms 27260 KB Output is correct
13 Correct 46 ms 26616 KB Output is correct
14 Correct 35 ms 26112 KB Output is correct
15 Correct 40 ms 26984 KB Output is correct
16 Correct 38 ms 25848 KB Output is correct
17 Correct 39 ms 27520 KB Output is correct
18 Correct 54 ms 29176 KB Output is correct
19 Correct 39 ms 25848 KB Output is correct
20 Correct 42 ms 27000 KB Output is correct

Subtask #4
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 23808 KB Output is correct
2 Correct 34 ms 25208 KB Output is correct
3 Correct 34 ms 25464 KB Output is correct
4 Correct 24 ms 24064 KB Output is correct
5 Correct 28 ms 24448 KB Output is correct
6 Correct 29 ms 24832 KB Output is correct
7 Correct 24 ms 25088 KB Output is correct
8 Correct 35 ms 24576 KB Output is correct
9 Correct 33 ms 25384 KB Output is correct
10 Correct 34 ms 25532 KB Output is correct
11 Correct 31 ms 25372 KB Output is correct
12 Correct 40 ms 27260 KB Output is correct
13 Correct 46 ms 26616 KB Output is correct
14 Correct 35 ms 26112 KB Output is correct
15 Correct 40 ms 26984 KB Output is correct
16 Correct 38 ms 25848 KB Output is correct
17 Correct 39 ms 27520 KB Output is correct
18 Correct 54 ms 29176 KB Output is correct
19 Correct 39 ms 25848 KB Output is correct
20 Correct 42 ms 27000 KB Output is correct
21 Correct 77 ms 29784 KB Output is correct
22 Correct 132 ms 33104 KB Output is correct
23 Correct 177 ms 35568 KB Output is correct
24 Correct 219 ms 41584 KB Output is correct
25 Correct 57 ms 34300 KB Output is correct
26 Correct 203 ms 44912 KB Output is correct
27 Correct 266 ms 40488 KB Output is correct
28 Correct 255 ms 53456 KB Output is correct
29 Correct 130 ms 45940 KB Output is correct
30 Correct 365 ms 43176 KB Output is correct

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 23808 KB Output is correct
2 Correct 34 ms 25208 KB Output is correct
3 Correct 34 ms 25464 KB Output is correct
4 Correct 24 ms 24064 KB Output is correct
5 Correct 28 ms 24448 KB Output is correct
6 Correct 29 ms 24832 KB Output is correct
7 Correct 24 ms 25088 KB Output is correct
8 Correct 35 ms 24576 KB Output is correct
9 Correct 33 ms 25384 KB Output is correct
10 Correct 34 ms 25532 KB Output is correct
11 Correct 2794 ms 126100 KB Output is correct
12 Execution timed out 4115 ms 223828 KB Time limit exceeded
13 Halted 0 ms 0 KB -