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답안 #731293

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
731293 2023-04-27T09:04:52 Z danikoynov Sky Walking (IOI19_walk) C++14
43 / 100
 218 ms 20796 KB 
#include "walk.h"
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

const int maxn = 1e5 + 10;

struct skywalk
{
    int left, right;
    ll height;

    skywalk(int _left = 0, int _right = 0, ll _height = 0)
    {
        left = _left;
        right = _right;
        height = _height;
    }
}sky[maxn];

bool cmp(const skywalk &sk1, const skywalk &sk2)
{
    return sk1.height < sk2.height;
}

const ll inf = 1e18;
struct node
{
    ll down_sum, up_sum;

    node(ll _down_sum = inf, ll _up_sum = inf)
    {
        down_sum = _down_sum;
        up_sum = _up_sum;
    }
};

node merge_nodes(node lf, node rf)
{
    node nd;
    nd.down_sum = min(lf.down_sum, rf.down_sum);
    nd.up_sum = min(lf.up_sum, rf.up_sum);
    return nd;
}

node tree[4 * maxn];
int is_active[maxn];
ll dp[maxn];
void toggle(int root, int left, int right, int pos)
{
    if (left == right)
    {
        is_active[left] ^= 1;
        ///cout << root << " : " << left << " : " << right << " : " << pos << " " << is_active[left] << endl;
        if (is_active[left])
        {
            tree[root].down_sum = - sky[left].height + dp[left];
            tree[root].up_sum = sky[left].height + dp[left];
            ///cout << "activate " << left << " " << sky[left].height << endl;
        }
        else
        {
            tree[root] = node();
        }
        return;
    }

    int mid = (left + right) / 2;

    if (pos <= mid)
        toggle(root * 2, left, mid, pos);
    else
        toggle(root * 2 + 1, mid + 1, right, pos);


    tree[root] = merge_nodes(tree[root * 2], tree[root * 2 + 1]);
    ///cout << "here " << left << " " << right << " " << tree[root].up_sum << endl;
}

node query(int root, int left, int right, int qleft, int qright)
{
    if (left > qright || right < qleft)
    return node();

    if (left >= qleft && right <= qright)
        return tree[root];

    int mid = (left + right) / 2;
    return merge_nodes(query(root * 2, left, mid, qleft, qright),
                       query(root * 2 + 1, mid + 1, right, qleft, qright));
}

int n, m;
ll x[maxn], h[maxn];
vector < pair < int, int > > upd[maxn];

ll state[100][100];
bool intersects(int idx, int pos)
{
    if (sky[idx].left <= pos && sky[idx].right >= pos && sky[idx].height <= h[pos])
        return true;
    return false;
}

void relax_state(int i)
{
                for (int p1 = 0; p1 < m; p1 ++)
            {
                if (!intersects(p1, i))
                    continue;
                for (int p2 = 0; p2 < m; p2 ++)
                {
                    if (!intersects(p2, i))
                        continue;
                    state[i][p2] = min(state[i][p2], state[i][p1] + abs(sky[p1].height - sky[p2].height));
                }
            }
}
long long min_distance(vector<int> X, vector<int> H, vector<int> l, vector<int> r, vector<int> y, int s, int g)
{
    n = X.size();
    m = l.size();
    for (int i = 0; i < n; i ++)
        x[i] = X[i], h[i] = H[i];
    for (int i = 0; i < m; i ++)
    {
        sky[i] = skywalk(l[i], r[i], y[i]);
    }
    sort(sky, sky + m, cmp);

    if (n <= 50 && m <= 50)
    {
        if (s > g)
            swap(s, g);

            /**cout << "skywalk" << endl;
            for (int j = 0; j < m; j ++)
            {
                cout << j << " : " << sky[j].left << " " << sky[j].right << " " << sky[j].height << endl;
            }
            cout << "------------" << endl;*/
            for (int i = 0; i < n; i ++)
                for (int j = 0; j < m; j ++)
                state[i][j] = inf;
        for (int j = 0; j < m; j ++)
        {
            if (intersects(j, s))
                state[s][j] = sky[j].height;
        }

        /**for (int i = s - 1; i >= 0; i --)
        {
            for (int j = i + 1; j <= s; j ++)
            {
                for (int p = 0; p < m; p ++)
                {
                    if (intersects(p, i) && intersects(p, j))
                    {
                        state[i][p] = min(state[i][p], state[j][p] + abs(x[j] - x[i]));
                    }
                }
            }
            relax_state(i);
        }*/

        /**for (int j = 0; j < m; j ++)
            cout << state[s][j] << " ";
        cout << endl;*/

        for (int i = 0; i < n; i ++)
        {
                        for (int j = 0; j < i; j ++)
            {
                for (int p = 0; p < m; p ++)
                {
                    if (intersects(p, i) && intersects(p, j))
                    {
                        state[i][p] = min(state[i][p], state[j][p] + abs(x[j] - x[i]));
                    }
                }
            }


            relax_state(i);
        }

        for (int i = n - 1; i >= g; i --)
        {
            for (int j = n - 1; j > i; j --)
            {
                for (int p = 0; p < m; p ++)
                {
                    if (intersects(p, i) && intersects(p, j))
                    {
                        state[i][p] = min(state[i][p], state[j][p] + abs(x[j] - x[i]));
                    }
                }
            }

            relax_state(i);
        }

        ll ans = inf;
        for (int j = 0; j < m; j ++)
        {
            if (state[g][j] != inf)
                ans = min(ans, state[g][j] + sky[j].height);
        }
        if (ans == inf)
            return -1;
        return ans;
    }
    if (s != 0 || g != n - 1)
        return 0;

         for (int i = 0; i < m; i ++)
        {
            upd[sky[i].left].push_back({i, 1});
        }
        for (int i = 0; i < m; i ++)
        {

            upd[sky[i].right].push_back({i, -1});
        }



    for (pair < int, int > cur : upd[s])
    {
        dp[cur.first] = sky[cur.first].height;
        toggle(1, 0, m - 1, cur.first);
        ///cout << "here" << endl;
    }


    ///cout << tree[1].up_sum << endl;
    for (int i = 1; i < g; i ++)
    {
        for (pair < int, int > cur : upd[i])
        {

            if (cur.second == 1)
            {
                node under = node(), above = node();
                if (cur.first != 0)
                    under = query(1, 0, m - 1, 0, cur.first - 1);
                if (cur.first != m - 1)
                    above = query(1, 0, m - 1, cur.first + 1, m - 1);
            //cout << under.down_sum << " " << above.up_sum << endl;

                if (under.down_sum == inf && above.up_sum == inf)
                    dp[cur.first] = inf;
                else
                    dp[cur.first] = min(sky[cur.first].height + under.down_sum, above.up_sum - sky[cur.first].height);
                ///cout << cur.first << " :: " << dp[cur.first] << endl;
            }


            toggle(1, 0, m - 1, cur.first);
        }
    }

    node ans = tree[1];
    if (ans.up_sum == inf)
        return -1;
    return ans.up_sum + x[g] - x[s];
}

Compilation message

walk.cpp: In function 'long long int min_distance(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, int, int)':
walk.cpp:134:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  134 |         if (s > g)
      |         ^~
walk.cpp:143:13: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
  143 |             for (int i = 0; i < n; i ++)
      |             ^~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 10404 KB Output is correct
2 Correct 6 ms 10452 KB Output is correct
3 Correct 5 ms 10452 KB Output is correct
4 Correct 7 ms 10452 KB Output is correct
5 Correct 5 ms 10452 KB Output is correct
6 Correct 6 ms 10452 KB Output is correct
7 Correct 5 ms 10452 KB Output is correct
8 Correct 5 ms 10452 KB Output is correct
9 Correct 5 ms 10452 KB Output is correct
10 Correct 5 ms 10452 KB Output is correct
11 Correct 6 ms 10452 KB Output is correct
12 Correct 5 ms 10452 KB Output is correct
13 Correct 5 ms 10452 KB Output is correct
14 Correct 5 ms 10452 KB Output is correct
15 Correct 5 ms 10452 KB Output is correct
16 Correct 5 ms 10452 KB Output is correct
17 Correct 6 ms 10452 KB Output is correct

Subtask #2
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 10452 KB Output is correct
2 Correct 5 ms 10480 KB Output is correct
3 Incorrect 48 ms 13160 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 76 ms 13908 KB Output is correct
2 Correct 140 ms 16332 KB Output is correct
3 Correct 131 ms 16972 KB Output is correct
4 Correct 182 ms 20720 KB Output is correct
5 Correct 183 ms 20368 KB Output is correct
6 Correct 174 ms 20680 KB Output is correct
7 Correct 94 ms 17632 KB Output is correct
8 Correct 216 ms 20384 KB Output is correct
9 Correct 186 ms 20684 KB Output is correct
10 Correct 134 ms 19660 KB Output is correct
11 Correct 15 ms 11988 KB Output is correct

Subtask #4
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 76 ms 13908 KB Output is correct
2 Correct 140 ms 16332 KB Output is correct
3 Correct 131 ms 16972 KB Output is correct
4 Correct 182 ms 20720 KB Output is correct
5 Correct 183 ms 20368 KB Output is correct
6 Correct 174 ms 20680 KB Output is correct
7 Correct 94 ms 17632 KB Output is correct
8 Correct 216 ms 20384 KB Output is correct
9 Correct 186 ms 20684 KB Output is correct
10 Correct 134 ms 19660 KB Output is correct
11 Correct 15 ms 11988 KB Output is correct
12 Correct 158 ms 17108 KB Output is correct
13 Correct 218 ms 20632 KB Output is correct
14 Correct 183 ms 20252 KB Output is correct
15 Correct 207 ms 20684 KB Output is correct
16 Correct 177 ms 20628 KB Output is correct
17 Correct 177 ms 20624 KB Output is correct
18 Correct 163 ms 20568 KB Output is correct
19 Correct 176 ms 20512 KB Output is correct
20 Correct 128 ms 17632 KB Output is correct
21 Correct 29 ms 13652 KB Output is correct
22 Correct 151 ms 19448 KB Output is correct
23 Correct 150 ms 19744 KB Output is correct
24 Correct 175 ms 19864 KB Output is correct
25 Correct 146 ms 19476 KB Output is correct
26 Correct 144 ms 19984 KB Output is correct
27 Correct 185 ms 20520 KB Output is correct
28 Correct 203 ms 20624 KB Output is correct
29 Correct 183 ms 20632 KB Output is correct
30 Correct 99 ms 17648 KB Output is correct
31 Correct 166 ms 20796 KB Output is correct
32 Correct 139 ms 20044 KB Output is correct
33 Correct 155 ms 20004 KB Output is correct
34 Correct 120 ms 20176 KB Output is correct
35 Correct 142 ms 20172 KB Output is correct
36 Correct 192 ms 20568 KB Output is correct
37 Correct 162 ms 19960 KB Output is correct
38 Correct 145 ms 20268 KB Output is correct
39 Correct 101 ms 20748 KB Output is correct
40 Correct 164 ms 20300 KB Output is correct
41 Correct 153 ms 20312 KB Output is correct

Subtask #5
0 / 43.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 10404 KB Output is correct
2 Correct 6 ms 10452 KB Output is correct
3 Correct 5 ms 10452 KB Output is correct
4 Correct 7 ms 10452 KB Output is correct
5 Correct 5 ms 10452 KB Output is correct
6 Correct 6 ms 10452 KB Output is correct
7 Correct 5 ms 10452 KB Output is correct
8 Correct 5 ms 10452 KB Output is correct
9 Correct 5 ms 10452 KB Output is correct
10 Correct 5 ms 10452 KB Output is correct
11 Correct 6 ms 10452 KB Output is correct
12 Correct 5 ms 10452 KB Output is correct
13 Correct 5 ms 10452 KB Output is correct
14 Correct 5 ms 10452 KB Output is correct
15 Correct 5 ms 10452 KB Output is correct
16 Correct 5 ms 10452 KB Output is correct
17 Correct 6 ms 10452 KB Output is correct
18 Correct 5 ms 10452 KB Output is correct
19 Correct 5 ms 10480 KB Output is correct
20 Incorrect 48 ms 13160 KB Output isn't correct
21 Halted 0 ms 0 KB -