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답안 #719328

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
719328 2023-04-05T18:29:18 Z Jarif_Rahman 고대 책들 (IOI17_books) C++17
22 / 100
 2000 ms 132292 KB 
#include <bits/stdc++.h>
#define pb push_back
#define f first
#define sc second
using namespace std;
typedef long long int ll;
typedef string str;

struct dsu{
    int n;
    vector<int> sz, p;
    dsu(int nn){
        n = nn;
        sz.resize(n, 1);
        p.resize(n);
        for(int i = 0; i < n; i++) p[i] = i;
    }
    int get(int x){
        if(p[x] != x) p[x] = get(p[x]);
        return p[x];
    }
    void unite(int a, int b){
        a = get(a), b  = get(b);
        if(a == b) return;
        if(sz[b] > sz[a]) swap(a, b);
        sz[a]+=sz[b];
        sz[b] = 0;
        p[b] = a;
    }
};
 
ll minimum_walk(vector<int> p, int s){
    int n = p.size();
    ll ans = 0;
 
    vector<int> C(n, -1), sz;
    int k = 0;
    for(int i = 0; i < n; i++){
        if(C[i] != -1) continue;
        int x = p[i];
        C[i] = k;
        sz.pb(1);
        ans+=abs(i-x);
        while(x != i){
            C[x] = k;
            sz.back()++;
            ans+=abs(p[x]-x);
            x = p[x];
        }
        k++;
    }

    //for(int x: C) cerr << x << " "; cerr << "C1\n";

    vector<int> first(k, -1), last(k);
    for(int i = 0; i < n; i++){
        if(first[C[i]] == -1) first[C[i]] = i;
        last[C[i]] = i;
    }

    int L, R;
    vector<bool> unnecessary(k, 0);
    for(int i = 0; i < n; i++){
        if(sz[C[i]] > 1 || i == s){
            L = i;
            break;
        }
        unnecessary[C[i]] = 1;
    }
    for(int i = n-1; i >= 0; i--){
        if(sz[C[i]] > 1 || i == s){
            R = i;
            break;
        }
        unnecessary[C[i]] = 1;
    }

    vector<set<int>> sth(k);
    for(int i = 0; i < n; i++) sth[C[i]].insert(i);

    dsu ds(k);
    for(int T = 0; T < k-1; T++){
        for(int i = 0; i+1 < n; i++){
            if(unnecessary[C[i]] || unnecessary[i+C[1]]) continue;
            if(C[i] == C[i+1]) continue;
            if(i == last[C[i]] && i+1 == first[C[i+1]]) continue;
            auto it = sth[C[i]].find(i);
            if(it != sth[C[i]].end() && i+1 == first[C[i+1]] && *next(it) > last[C[i+1]])
                continue;
            it = sth[C[i+1]].find(i+1);
            if(it != sth[C[i+1]].begin() && i == last[C[i]] && *prev(it) < first[C[i]])
                continue;
            ds.unite(C[i], C[i+1]);
        }

        for(int &x: C) x = ds.get(x);
        first.assign(k, -1);
        for(int i = 0; i < n; i++){
            if(first[C[i]] == -1) first[C[i]] = i;
            last[C[i]] = i;
        }
        for(int i = 0; i < k; i++){
            if(unnecessary[i] || ds.get(i) == i) continue;
            int p = ds.get(i);
            if(sth[p].size() < sth[i].size()) swap(sth[p], sth[i]);
            for(int x: sth[i]) sth[p].insert(x);
            sth[i].clear();
        }
    }

    //for(int x: C) cerr << x << " "; cerr << "C2\n";

    int l = first[C[s]], r = last[C[s]];
    while(l > L || r < R){
        int in = -1;
        ll lx = 0, rx = 0;
        for(int i = l-1; i >= 0; i--){
            if(unnecessary[C[i]]) break;
            if(C[i] == C[i+1]) continue;
            lx+=2;
            if(i != last[C[i]]){
                in = i;
                break;
            }
            i = first[C[i]];
        }
        for(int i = r+1; i < n; i++){
            if(unnecessary[C[i]]) break;
            if(C[i] == C[i-1]) continue;
            rx+=2;
            if(i != first[C[i]]){
                in = i;
                break;
            }
            i = last[C[i]];
        }

        if(in == -1){
            ans+=lx+rx;
            break;
        }
        ans+=min(lx, rx);
        l = first[C[in]], r = last[C[in]];
    }

    return ans;
}

Subtask #1
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 300 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 300 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 296 KB Output is correct
11 Correct 1 ms 260 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 296 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 0 ms 212 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 300 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 300 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 296 KB Output is correct
11 Correct 1 ms 260 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 296 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 0 ms 212 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 10 ms 340 KB Output is correct
22 Correct 11 ms 292 KB Output is correct
23 Correct 11 ms 404 KB Output is correct
24 Correct 6 ms 400 KB Output is correct
25 Correct 8 ms 392 KB Output is correct
26 Correct 2 ms 340 KB Output is correct
27 Correct 2 ms 296 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 16 ms 408 KB Output is correct

Subtask #3
0 / 28.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 300 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 300 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 296 KB Output is correct
11 Correct 1 ms 260 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 296 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 0 ms 212 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 10 ms 340 KB Output is correct
22 Correct 11 ms 292 KB Output is correct
23 Correct 11 ms 404 KB Output is correct
24 Correct 6 ms 400 KB Output is correct
25 Correct 8 ms 392 KB Output is correct
26 Correct 2 ms 340 KB Output is correct
27 Correct 2 ms 296 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 16 ms 408 KB Output is correct
30 Correct 530 ms 75592 KB Output is correct
31 Correct 746 ms 77972 KB Output is correct
32 Execution timed out 2055 ms 132292 KB Time limit exceeded
33 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 412 KB Output is correct
2 Correct 9 ms 396 KB Output is correct
3 Correct 8 ms 340 KB Output is correct
4 Execution timed out 2079 ms 340 KB Time limit exceeded
5 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 300 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 300 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 296 KB Output is correct
11 Correct 1 ms 260 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 296 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 0 ms 212 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 10 ms 340 KB Output is correct
22 Correct 11 ms 292 KB Output is correct
23 Correct 11 ms 404 KB Output is correct
24 Correct 6 ms 400 KB Output is correct
25 Correct 8 ms 392 KB Output is correct
26 Correct 2 ms 340 KB Output is correct
27 Correct 2 ms 296 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 16 ms 408 KB Output is correct
30 Correct 530 ms 75592 KB Output is correct
31 Correct 746 ms 77972 KB Output is correct
32 Execution timed out 2055 ms 132292 KB Time limit exceeded
33 Halted 0 ms 0 KB -