oj.uz

Submission #1061517

# Submission time Handle Problem Language Result Execution time Memory
1061517 2024-08-16T10:27:25 Z onbert Ancient Books (IOI17_books) C++17
12 / 100
 8 ms 8796 KB 
#include "books.h"
#include <bits/stdc++.h>
using namespace std;
#define int long long
const int maxn = 1e6 + 5, INF = 1e9;
int p[maxn];
int vis[maxn];
bool taken[maxn];

int minimum_walk(vector<int32_t> P, int32_t s) {
    int n = P.size();
    for (int i=0;i<n;i++) p[i] = P[i];
    for (int i=0;i<n;i++) vis[i] = 0;
    int ans = 0, cnt = 0;
    vector<pair<int,int>> vec = {{-1, -1}};
    for (int i=0;i<n;i++) if (!vis[i]) {
        if (p[i]==i && i==s) {
            cnt++;
            vis[i] = cnt;
            vec.push_back({s, s});
        }
        if (p[i]==i) continue;
        int u = i;
        pair<int,int> val = {u, u};
        cnt++;
        while (true) {
            vis[u] = cnt;
            val.first = min(u, val.first);
            val.second = max(u, val.second);
            int v = p[u];
            ans += abs(v-u);
            if (v==i) break;
            u = v;
        }
        vec.push_back(val);
    }

    sort(vec.begin(), vec.end());
    int lastl = vec[1].first, mx = vec[1].second;
    int LL = -1, RR = -1;
    bool done = false;
    for (int i=2;i<vec.size();i++) {
        if (vec[i].first > mx) {
            if (lastl<=s && s<=mx) {
                LL = lastl, RR = mx;
            }
            lastl = vec[i].first;
            ans += (vec[i].first - mx)*2;
            assert(!done);
            done = true;
        }
        mx = max(vec[i].second, mx);
    }
    if (LL==-1) LL = lastl, RR = mx;

    priority_queue<pair<int,int>, vector<pair<int,int>>, greater<pair<int,int>>> pq;
    pq.push({0, vis[s]});

    int dist[cnt+5];
    for (int i=1;i<=cnt;i++) dist[i] = -1;
    while (pq.size() > 0) {
        int u = pq.top().second, d = pq.top().first;
        pq.pop();
        if (vec[u].second < LL || vec[u].first > RR) dist[u] = -2;
        if (dist[u]!=-1) continue;
        dist[u] = d;
        for (int i=vec[u].first; i<=vec[u].second;i++) {
            if (p[i]!=i && dist[vis[i]]==-1) pq.push({d, vis[i]});
        }
        for (int i=vec[u].first-1;i>=LL;i--) {
            if (p[i]!=i) {
                if (dist[vis[i]]==-1) pq.push({d + (vec[u].first - i)*2, vis[i]});
            }
        }
        for (int i=vec[u].second+1;i<=RR;i++) {
            if (p[i]!=i) {
                if (dist[vis[i]]==-1) pq.push({d + (i - vec[u].first)*2, vis[i]});
            }
        }
    }
    int MX = 0;
    for (int i=1;i<=cnt;i++) if (dist[i]!=-1) MX = max(dist[i], MX);
    ans += MX;

    return ans;
}

Compilation message

books.cpp: In function 'long long int minimum_walk(std::vector<int>, int32_t)':
books.cpp:42:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |     for (int i=2;i<vec.size();i++) {
      |                  ~^~~~~~~~~~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 0 ms 4444 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 0 ms 4444 KB Output is correct
5 Correct 1 ms 4440 KB Output is correct
6 Correct 1 ms 4444 KB Output is correct
7 Correct 1 ms 4440 KB Output is correct
8 Correct 1 ms 4444 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct
10 Correct 1 ms 4444 KB Output is correct
11 Correct 1 ms 4444 KB Output is correct
12 Correct 1 ms 4444 KB Output is correct
13 Correct 1 ms 4444 KB Output is correct
14 Correct 1 ms 4444 KB Output is correct
15 Correct 1 ms 4444 KB Output is correct
16 Correct 1 ms 4540 KB Output is correct
17 Correct 1 ms 4444 KB Output is correct
18 Correct 1 ms 4444 KB Output is correct

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 0 ms 4444 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 0 ms 4444 KB Output is correct
5 Correct 1 ms 4440 KB Output is correct
6 Correct 1 ms 4444 KB Output is correct
7 Correct 1 ms 4440 KB Output is correct
8 Correct 1 ms 4444 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct
10 Correct 1 ms 4444 KB Output is correct
11 Correct 1 ms 4444 KB Output is correct
12 Correct 1 ms 4444 KB Output is correct
13 Correct 1 ms 4444 KB Output is correct
14 Correct 1 ms 4444 KB Output is correct
15 Correct 1 ms 4444 KB Output is correct
16 Correct 1 ms 4540 KB Output is correct
17 Correct 1 ms 4444 KB Output is correct
18 Correct 1 ms 4444 KB Output is correct
19 Correct 1 ms 4444 KB Output is correct
20 Correct 1 ms 4444 KB Output is correct
21 Correct 1 ms 4440 KB Output is correct
22 Runtime error 4 ms 8796 KB Execution killed with signal 6
23 Halted 0 ms 0 KB -

Subtask #3
0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 0 ms 4444 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 0 ms 4444 KB Output is correct
5 Correct 1 ms 4440 KB Output is correct
6 Correct 1 ms 4444 KB Output is correct
7 Correct 1 ms 4440 KB Output is correct
8 Correct 1 ms 4444 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct
10 Correct 1 ms 4444 KB Output is correct
11 Correct 1 ms 4444 KB Output is correct
12 Correct 1 ms 4444 KB Output is correct
13 Correct 1 ms 4444 KB Output is correct
14 Correct 1 ms 4444 KB Output is correct
15 Correct 1 ms 4444 KB Output is correct
16 Correct 1 ms 4540 KB Output is correct
17 Correct 1 ms 4444 KB Output is correct
18 Correct 1 ms 4444 KB Output is correct
19 Correct 1 ms 4444 KB Output is correct
20 Correct 1 ms 4444 KB Output is correct
21 Correct 1 ms 4440 KB Output is correct
22 Runtime error 4 ms 8796 KB Execution killed with signal 6
23 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 5080 KB Output is correct
2 Correct 5 ms 5092 KB Output is correct
3 Correct 8 ms 5588 KB Output is correct
4 Runtime error 4 ms 8792 KB Execution killed with signal 6
5 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 0 ms 4444 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 0 ms 4444 KB Output is correct
5 Correct 1 ms 4440 KB Output is correct
6 Correct 1 ms 4444 KB Output is correct
7 Correct 1 ms 4440 KB Output is correct
8 Correct 1 ms 4444 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct
10 Correct 1 ms 4444 KB Output is correct
11 Correct 1 ms 4444 KB Output is correct
12 Correct 1 ms 4444 KB Output is correct
13 Correct 1 ms 4444 KB Output is correct
14 Correct 1 ms 4444 KB Output is correct
15 Correct 1 ms 4444 KB Output is correct
16 Correct 1 ms 4540 KB Output is correct
17 Correct 1 ms 4444 KB Output is correct
18 Correct 1 ms 4444 KB Output is correct
19 Correct 1 ms 4444 KB Output is correct
20 Correct 1 ms 4444 KB Output is correct
21 Correct 1 ms 4440 KB Output is correct
22 Runtime error 4 ms 8796 KB Execution killed with signal 6
23 Halted 0 ms 0 KB -