oj.uz

Submission #767065

# Submission time Handle Problem Language Result Execution time Memory
767065 2023-06-26T10:53:34 Z danikoynov Ancient Books (IOI17_books) C++14
42 / 100
 111 ms 16264 KB 
#include "books.h"
#include<bits/stdc++.h>

using namespace std;
typedef long long ll;


const int maxn = 1e3 + 10;
const ll inf = 1e18;
ll used[maxn], l[maxn], r[maxn], n, dp[maxn][maxn];
int bef[maxn], aft[maxn];
vector < int > st[maxn];
ll distance(int l, int r, int i, int j)
{
    if (i <= l && j >= r)
    {
        int mx = 1e9;
        for (int idx : st[used[i]])
        {
            if (idx >= l && idx <= r)
            {
                mx = 0;
                break;
            }
            mx = min(mx, abs(idx - l));
            mx = min(mx, abs(idx - r));
        }
        return mx * 2;
    }
    if (i > r)
        return (i - r) * 2;
    if (j < l)
        return (l - j) * 2;
    return 0;
}
long long minimum_walk(vector<int> p, int s)
{
    n = p.size();
    if (n > 1000)
    {
        int cnt = 0;
    ll mx = 0, ans = 0;
    int to = 0;
    for (int i = 0; i < n; i ++)
    {
        if (p[i] == i)
            continue;
            ans = ans + (ll)abs(i - p[i]);
            ///cout << ans << endl;
        if (!used[i])
        {
            if (to < i)
                mx = mx + i - to;
            int v = p[i];
            while(v != i)
            {

                to = max(to, v);
                used[v] = 1;
                v = p[v];
            }
            to = max(to, v);
            used[v] = 1;
        }
    }
	return ans + 2 * mx;
    }
    int cnt = 0;
    ll ans = 0;
    for (int i = 0; i < n; i ++)
    {
        ans = ans + abs(p[i] - i);
        if (p[i] == i)
            continue;
        if (used[i])
            continue;

        cnt ++;
        used[i] = cnt;
        int v = p[i];
        l[cnt] = i;
        r[cnt] = i;
        st[cnt].push_back(i);
        while(v != i)
        {
            st[cnt].push_back(v);
            used[v] = cnt;
            r[cnt] = max(r[cnt], (ll)v);
            v = p[v];
        }
    }

    bef[0] = used[0];
    for (int i = 1; i < n; i ++)
    {
        bef[i] = bef[i - 1];
        if (used[i] != 0)
            bef[i] = used[i];
    }

    aft[n - 1] = used[n - 1];
    for (int i = n - 2; i >= 0; i --)
    {
        aft[i] = aft[i + 1];
        if (used[i] != 0)
            aft[i] = used[i];
    }

    for (int i = 0; i < n; i ++)
        for (int j = 0; j < n; j ++)
            dp[i][j] = inf;

    dp[s][s] = 0;
    ///if (used[s] != 0)
       /// dp[l[used[s]]][r[used[s]]] = 0;

    /**cout << "-------------" << endl;
    for (int i = 1; i <= cnt; i ++)
        cout << l[i] << " " << r[i] << endl;
    cout << "-------------" << endl;*/
    for (int len = 1; len <= n; len ++)
    {
        for (int i = 0; i < n - len + 1; i ++)
        {
            int j = i + len - 1;
            if (dp[i][j] == inf)
                continue;
                ///cout << i << " " << j << " " << dp[i][j] << endl;
            vector < int > idx;
            /**if (i != 0 && bef[i - 1] != 0)
                idx.push_back(bef[i - 1]);
            if (j != n - 1 && aft[j + 1] != 0)
                idx.push_back(aft[j + 1]);*/
                for (int p = 1; p <= cnt; p ++)
                    idx.push_back(p);
            for (int cur : idx)
            {
                int newl = min((ll)i, l[cur]);
                int newr = max((ll)j, r[cur]);
                if (dp[newl][newr] > dp[i][j] + distance(i, j, l[cur], r[cur]))
                {
                    dp[newl][newr] = dp[i][j] + distance(i, j, l[cur], r[cur]);
                    ///cout << "to " << newl << " " << newr << endl;
                }
                ///dp[newl][newr] = min(dp[newl][newr], dp[i][j] + distance(i, j, l[cur], r[cur]));
            }

        }

    }

    int lf = 0;
    int rf = n - 1;
    while(lf < s && used[lf] == 0)
        lf ++;
    while(rf > s && used[rf] == 0)
        rf --;
    ///cout << dp[lf][rf] << endl;
    ///cout << lf << " " << rf << endl;
    return ans + dp[lf][rf];


}

Compilation message

books.cpp: In function 'long long int minimum_walk(std::vector<int>, int)':
books.cpp:46:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   46 |         if (p[i] == i)
      |         ^~
books.cpp:48:13: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   48 |             ans = ans + (ll)abs(i - p[i]);
      |             ^~~
books.cpp:41:13: warning: unused variable 'cnt' [-Wunused-variable]
   41 |         int cnt = 0;
      |             ^~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 0 ms 340 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 0 ms 340 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 0 ms 340 KB Output is correct
17 Correct 0 ms 340 KB Output is correct
18 Correct 0 ms 340 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 0 ms 340 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 0 ms 340 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 0 ms 340 KB Output is correct
17 Correct 0 ms 340 KB Output is correct
18 Correct 0 ms 340 KB Output is correct
19 Correct 5 ms 8148 KB Output is correct
20 Correct 5 ms 8148 KB Output is correct
21 Correct 4 ms 8148 KB Output is correct
22 Correct 5 ms 8276 KB Output is correct
23 Correct 5 ms 8276 KB Output is correct
24 Correct 4 ms 8276 KB Output is correct
25 Correct 5 ms 8276 KB Output is correct
26 Correct 4 ms 8148 KB Output is correct
27 Correct 4 ms 8276 KB Output is correct
28 Correct 4 ms 8148 KB Output is correct
29 Correct 5 ms 8276 KB Output is correct

Subtask #3
0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 0 ms 340 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 0 ms 340 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 0 ms 340 KB Output is correct
17 Correct 0 ms 340 KB Output is correct
18 Correct 0 ms 340 KB Output is correct
19 Correct 5 ms 8148 KB Output is correct
20 Correct 5 ms 8148 KB Output is correct
21 Correct 4 ms 8148 KB Output is correct
22 Correct 5 ms 8276 KB Output is correct
23 Correct 5 ms 8276 KB Output is correct
24 Correct 4 ms 8276 KB Output is correct
25 Correct 5 ms 8276 KB Output is correct
26 Correct 4 ms 8148 KB Output is correct
27 Correct 4 ms 8276 KB Output is correct
28 Correct 4 ms 8148 KB Output is correct
29 Correct 5 ms 8276 KB Output is correct
30 Runtime error 82 ms 16264 KB Execution killed with signal 11
31 Halted 0 ms 0 KB -

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 8272 KB Output is correct
2 Correct 5 ms 8148 KB Output is correct
3 Correct 16 ms 8272 KB Output is correct
4 Correct 19 ms 8276 KB Output is correct
5 Correct 18 ms 8272 KB Output is correct
6 Correct 27 ms 8148 KB Output is correct
7 Correct 30 ms 8272 KB Output is correct
8 Correct 111 ms 8276 KB Output is correct
9 Correct 82 ms 8268 KB Output is correct
10 Correct 5 ms 8148 KB Output is correct
11 Correct 38 ms 8276 KB Output is correct
12 Correct 39 ms 8276 KB Output is correct
13 Correct 29 ms 8276 KB Output is correct
14 Correct 20 ms 8280 KB Output is correct
15 Correct 8 ms 8276 KB Output is correct
16 Correct 5 ms 8276 KB Output is correct
17 Correct 5 ms 8148 KB Output is correct
18 Correct 45 ms 8276 KB Output is correct
19 Correct 44 ms 8276 KB Output is correct
20 Correct 6 ms 8276 KB Output is correct

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 0 ms 340 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 0 ms 340 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 0 ms 340 KB Output is correct
17 Correct 0 ms 340 KB Output is correct
18 Correct 0 ms 340 KB Output is correct
19 Correct 5 ms 8148 KB Output is correct
20 Correct 5 ms 8148 KB Output is correct
21 Correct 4 ms 8148 KB Output is correct
22 Correct 5 ms 8276 KB Output is correct
23 Correct 5 ms 8276 KB Output is correct
24 Correct 4 ms 8276 KB Output is correct
25 Correct 5 ms 8276 KB Output is correct
26 Correct 4 ms 8148 KB Output is correct
27 Correct 4 ms 8276 KB Output is correct
28 Correct 4 ms 8148 KB Output is correct
29 Correct 5 ms 8276 KB Output is correct
30 Runtime error 82 ms 16264 KB Execution killed with signal 11
31 Halted 0 ms 0 KB -