oj.uz

답안 #693212

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
693212 2023-02-02T13:09:59 Z sharaelong 고대 책들 (IOI17_books) C++17
12 / 100
 34 ms 59092 KB 
#include "books.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;

struct DisjointSet {
    int n;
    vector<int> parent, rank;
    DisjointSet(int _n) : n(_n) {
        parent.resize(n);
        iota(parent.begin(), parent.end(), 0);
        rank.resize(n, 0);
    }

    int find(int u) {
        return parent[u] = (u == parent[u] ? u : find(parent[u]));
    }

    void merge(int u, int v) {
        u = find(u); v = find(v);
        if (u == v) return;
        if (rank[u] > rank[v]) swap(u, v);
        parent[u] = v;
        if (rank[u] == rank[v]) ++rank[v];
    }
};

struct FenwickTree {
    vector<int> tree;
    FenwickTree(int size) {
        tree.resize(size+1, 0);
    }

    int sum(int pos) {
        int ret = 0;
        for (int i=pos+1; i>0; i &= (i-1)) ret += tree[i];
        return ret;
    }

    void add(int pos, int val) {
        for (int i=pos+1; i<tree.size(); i+=(i & -i)) tree[i] += val;
    }
};

const int MAX_N = 1e6 + 1;
const ll INF = 4e18;

DisjointSet dsu(MAX_N);
FenwickTree fen(MAX_N);
bool visited[MAX_N];
vector<int> cycle[MAX_N];
vector<int> adj[MAX_N];

void dfs(int here, int parent = -1) {
    // cout << here << ' ' << parent << ": ";
    // for (int x:cycle[here]) cout << x << ' ';
    // cout << endl;
    bool merged = false;
    if (parent != -1) {
        parent = dsu.find(parent);
        int mn = *min_element(cycle[here].begin(), cycle[here].end());
        int mx = *max_element(cycle[here].begin(), cycle[here].end());
        if (fen.sum(mx) - fen.sum(mn) > 0) {
            dsu.merge(here, parent);
            for (int x: cycle[here]) fen.add(x, 1);
            if (cycle[here].size() > cycle[parent].size()) swap(cycle[here], cycle[parent]);
            for (int x: cycle[here]) cycle[parent].push_back(x);
            merged = true;
        }
    }
    
    if (!merged) {
        for (int x: cycle[here]) assert(fen.sum(x)-fen.sum(x-1) == 0);
        for (int x: cycle[here]) fen.add(x, 1);
    }
    for (int there: adj[here]) {
        dfs(there, here);
    }
    if (!merged) {
        for (int x: cycle[dsu.find(here)]) fen.add(x, -1);
        for (int x: cycle[dsu.find(here)]) assert(fen.sum(x)-fen.sum(x-1)==0);
    }
}

ll minimum_walk(vector<int> p, int s) {
    int n = p.size();
    vector<pair<pii, int>> range;
    ll jump_len = 0;
    for (int i=0; i<n; ++i) {
        if (!visited[i]) {
            int l = i, r = i;
            jump_len += abs(i-p[i]);
            visited[i] = true;
            int x = p[i];
            while (x != i) {
                l = min(l, x);
                r = max(r, x);
                jump_len += abs(x-p[x]);
                visited[x] = true;
                dsu.merge(x, i);
                x = p[x];
            }
            if (l < r) range.push_back({ { l, r }, i });
        }
    }
    
    sort(range.begin(), range.end());
    // set<pii> intv_set;
    // for (int i=0; i<range.size(); ++i) {
    //     auto[l, r] = range[i].first;
    //     auto it = intv_set.lower_bound({l, 0});
    //     while (it != intv_set.end() && (*it).first < r) {
    //         dsu.merge(range[i].second, (*it).second);
    //         it = next(it);
    //     }
    //     intv_set.insert({ r, range[i].second });
    // }
    for (int i=0; i<range.size(); ++i) {
        for (int j=i+1; j<range.size(); ++j) {
            auto[l1, r1] = range[i].first;
            auto[l2, r2] = range[j].first;
            if (l2 < r1 && r1 < r2) dsu.merge(range[i].second, range[j].second);
        }
    }
    
    vector<pair<pii, int>> dfs_order;
    for (int i=0; i<n; ++i) cycle[dsu.find(i)].push_back(i);
    for (int i=0; i<n; ++i) {
        if (dsu.find(i) == i && cycle[i].size() >= 2) {
            dfs_order.push_back({ { cycle[i][0], cycle[i].back() }, i });
        }
    }
    sort(dfs_order.begin(), dfs_order.end());
    
    vector<pii> st;
    vector<int> roots;
    for (int i=0; i<dfs_order.size(); ++i) {
        while (!st.empty() && st.back().first < dfs_order[i].first.first) st.pop_back();
        if (!st.empty()) adj[st.back().second].push_back(dfs_order[i].second);
        else roots.push_back(dfs_order[i].second);
        st.push_back({ dfs_order[i].first.second, dfs_order[i].second });
    }
    for (int r: roots) dfs(r);

    ll ans = 0;
    for (int i=0; i<roots.size(); ++i) {
        int r = dsu.find(roots[i]);
        sort(cycle[r].begin(), cycle[r].end());
        // for (int x: cycle[r]) cout << x << ' ';
        // cout << endl;
        if (i > 0) ans += cycle[r][0];
        if (i+1 < roots.size()) ans -= cycle[r].back();
        
        if (cycle[r][0] <= s && s <= cycle[r].back()) {
            ll tmp = INF;
            for (int x: cycle[r]) tmp = min(tmp, (ll)abs(x-s));
            ans += tmp;
        }
    }
    if (!roots.empty()) {
        if (s < cycle[dsu.find(roots[0])][0]) ans += cycle[dsu.find(roots[0])][0]-s;
        if (s > cycle[dsu.find(roots.back())].back()) ans += s-cycle[dsu.find(roots.back())].back();
    }
    return jump_len + 2ll * ans;
}

Compilation message

books.cpp: In member function 'void FenwickTree::add(int, int)':
books.cpp:42:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |         for (int i=pos+1; i<tree.size(); i+=(i & -i)) tree[i] += val;
      |                           ~^~~~~~~~~~~~
books.cpp: In function 'll minimum_walk(std::vector<int>, int)':
books.cpp:119:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::pair<int, int>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  119 |     for (int i=0; i<range.size(); ++i) {
      |                   ~^~~~~~~~~~~~~
books.cpp:120:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::pair<int, int>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  120 |         for (int j=i+1; j<range.size(); ++j) {
      |                         ~^~~~~~~~~~~~~
books.cpp:138:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::pair<int, int>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  138 |     for (int i=0; i<dfs_order.size(); ++i) {
      |                   ~^~~~~~~~~~~~~~~~~
books.cpp:147:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  147 |     for (int i=0; i<roots.size(); ++i) {
      |                   ~^~~~~~~~~~~~~
books.cpp:153:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  153 |         if (i+1 < roots.size()) ans -= cycle[r].back();
      |             ~~~~^~~~~~~~~~~~~~

Subtask #1
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 31 ms 58964 KB Output is correct
2 Correct 30 ms 59036 KB Output is correct
3 Correct 29 ms 58952 KB Output is correct
4 Correct 29 ms 58980 KB Output is correct
5 Correct 31 ms 58952 KB Output is correct
6 Correct 29 ms 58956 KB Output is correct
7 Correct 30 ms 58964 KB Output is correct
8 Correct 34 ms 58972 KB Output is correct
9 Correct 29 ms 58964 KB Output is correct
10 Correct 30 ms 59092 KB Output is correct
11 Correct 29 ms 58964 KB Output is correct
12 Correct 29 ms 58916 KB Output is correct
13 Correct 33 ms 58964 KB Output is correct
14 Correct 29 ms 58964 KB Output is correct
15 Correct 34 ms 58948 KB Output is correct
16 Correct 32 ms 59008 KB Output is correct
17 Correct 29 ms 58968 KB Output is correct
18 Correct 29 ms 58912 KB Output is correct

Subtask #2
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 31 ms 58964 KB Output is correct
2 Correct 30 ms 59036 KB Output is correct
3 Correct 29 ms 58952 KB Output is correct
4 Correct 29 ms 58980 KB Output is correct
5 Correct 31 ms 58952 KB Output is correct
6 Correct 29 ms 58956 KB Output is correct
7 Correct 30 ms 58964 KB Output is correct
8 Correct 34 ms 58972 KB Output is correct
9 Correct 29 ms 58964 KB Output is correct
10 Correct 30 ms 59092 KB Output is correct
11 Correct 29 ms 58964 KB Output is correct
12 Correct 29 ms 58916 KB Output is correct
13 Correct 33 ms 58964 KB Output is correct
14 Correct 29 ms 58964 KB Output is correct
15 Correct 34 ms 58948 KB Output is correct
16 Correct 32 ms 59008 KB Output is correct
17 Correct 29 ms 58968 KB Output is correct
18 Correct 29 ms 58912 KB Output is correct
19 Correct 29 ms 59044 KB Output is correct
20 Correct 29 ms 58944 KB Output is correct
21 Correct 34 ms 58956 KB Output is correct
22 Correct 33 ms 59040 KB Output is correct
23 Correct 33 ms 59056 KB Output is correct
24 Correct 31 ms 59020 KB Output is correct
25 Correct 34 ms 58956 KB Output is correct
26 Incorrect 29 ms 59008 KB 3rd lines differ - on the 1st token, expected: '12988', found: '13018'
27 Halted 0 ms 0 KB -

Subtask #3
0 / 28.0

# 결과 실행 시간 메모리 Grader output
1 Correct 31 ms 58964 KB Output is correct
2 Correct 30 ms 59036 KB Output is correct
3 Correct 29 ms 58952 KB Output is correct
4 Correct 29 ms 58980 KB Output is correct
5 Correct 31 ms 58952 KB Output is correct
6 Correct 29 ms 58956 KB Output is correct
7 Correct 30 ms 58964 KB Output is correct
8 Correct 34 ms 58972 KB Output is correct
9 Correct 29 ms 58964 KB Output is correct
10 Correct 30 ms 59092 KB Output is correct
11 Correct 29 ms 58964 KB Output is correct
12 Correct 29 ms 58916 KB Output is correct
13 Correct 33 ms 58964 KB Output is correct
14 Correct 29 ms 58964 KB Output is correct
15 Correct 34 ms 58948 KB Output is correct
16 Correct 32 ms 59008 KB Output is correct
17 Correct 29 ms 58968 KB Output is correct
18 Correct 29 ms 58912 KB Output is correct
19 Correct 29 ms 59044 KB Output is correct
20 Correct 29 ms 58944 KB Output is correct
21 Correct 34 ms 58956 KB Output is correct
22 Correct 33 ms 59040 KB Output is correct
23 Correct 33 ms 59056 KB Output is correct
24 Correct 31 ms 59020 KB Output is correct
25 Correct 34 ms 58956 KB Output is correct
26 Incorrect 29 ms 59008 KB 3rd lines differ - on the 1st token, expected: '12988', found: '13018'
27 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 28 ms 59012 KB 3rd lines differ - on the 1st token, expected: '3304', found: '3590'
2 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 31 ms 58964 KB Output is correct
2 Correct 30 ms 59036 KB Output is correct
3 Correct 29 ms 58952 KB Output is correct
4 Correct 29 ms 58980 KB Output is correct
5 Correct 31 ms 58952 KB Output is correct
6 Correct 29 ms 58956 KB Output is correct
7 Correct 30 ms 58964 KB Output is correct
8 Correct 34 ms 58972 KB Output is correct
9 Correct 29 ms 58964 KB Output is correct
10 Correct 30 ms 59092 KB Output is correct
11 Correct 29 ms 58964 KB Output is correct
12 Correct 29 ms 58916 KB Output is correct
13 Correct 33 ms 58964 KB Output is correct
14 Correct 29 ms 58964 KB Output is correct
15 Correct 34 ms 58948 KB Output is correct
16 Correct 32 ms 59008 KB Output is correct
17 Correct 29 ms 58968 KB Output is correct
18 Correct 29 ms 58912 KB Output is correct
19 Correct 29 ms 59044 KB Output is correct
20 Correct 29 ms 58944 KB Output is correct
21 Correct 34 ms 58956 KB Output is correct
22 Correct 33 ms 59040 KB Output is correct
23 Correct 33 ms 59056 KB Output is correct
24 Correct 31 ms 59020 KB Output is correct
25 Correct 34 ms 58956 KB Output is correct
26 Incorrect 29 ms 59008 KB 3rd lines differ - on the 1st token, expected: '12988', found: '13018'
27 Halted 0 ms 0 KB -