oj.uz

Submission #446413

# Submission time Handle Problem Language Result Execution time Memory
446413 2021-07-21T21:23:53 Z luciocf Fountain Parks (IOI21_parks) C++17
30 / 100
 517 ms 56836 KB 
#include <bits/stdc++.h>
#include "parks.h"

using namespace std;

const int maxn = 2e5+10;

int linha[] = {-2, 2, 0, 0};
int coluna[] = {0, 0, -2, 2};

struct Pt
{
    int x, y, ind;
} a[maxn];

struct Road
{
    int u, v, x, y;
} road[maxn];

bool mark[maxn];

struct DSU
{
    int pai[maxn], peso[maxn];

    void init(int n)
    {
        for (int i = 1; i <= n; i++)
            pai[i] = i;
    }

    int Find(int x)
    {
        if (pai[x] == x) return x;
        return pai[x] = Find(pai[x]);
    }

    void Join(int x, int y)
    {
        x = Find(x), y = Find(y);
        if (x == y) return;

        if (peso[x] < peso[y]) swap(x, y);

        pai[y] = x, peso[x] += peso[y]; 
    }
} dsu;

bool comp(Pt a, Pt b)
{
    if (a.x == b.x) return a.y < b.y;
    return a.x < b.x;
}

int construct_roads(vector<int> X, vector<int> Y)
{
    int n = X.size();

    bool sub = 1;
    int mn = 8, mx = 0;

    map<pair<int, int>, int> mp;

    for (int i = 1; i <= n; i++)
    {
        a[i] = {X[i-1], Y[i-1], i};

        mp[{a[i].x, a[i].y}] = i;

        mx = max(mx, a[i].x);
        mn = min(mn, a[i].x);
    }

    if (mx > 6) sub = 0;

    dsu.init(n);

    if (sub)
    {
        map<pair<int, int>, int> bench;

        sort(a+1, a+n+1, comp);

        int ind = 0;

        for (int i = 1; i < n; i++)
        {
            if (dsu.Find(a[i].ind) != dsu.Find(a[i+1].ind) && a[i].x == a[i+1].x && a[i].y+2 == a[i+1].y)
            {
                dsu.Join(a[i].ind, a[i+1].ind);

                road[++ind] = {a[i].ind, a[i+1].ind, a[i].x-1, a[i].y+1};

                if (a[i].x == mx)
                {
                    road[ind].x = a[i].x+1, road[ind].y = a[i].y+1;
                    bench[{a[i].x+1, a[i].y+1}] = 1;
                }
                else if (a[i].x == mn)
                {
                    bench[{a[i].x-1, a[i].y+1}] = 1;
                } 
                else
                {
                    if (bench[{a[i].x-1, a[i].y+1}] == 1)
                    {
                        road[ind].x = a[i].x+1, road[ind].y = a[i].y+1;
                        bench[{a[i].x+1, a[i].y+1}] = 1;
                    }
                    else
                    {
                        bench[{a[i].x-1, a[i].y+1}] = 1;
                    }
                }
            }

            if (mp[{a[i].x+2, a[i].y}] && dsu.Find(a[i].ind) != dsu.Find(mp[{a[i].x+2, a[i].y}]))
            {
                dsu.Join(a[i].ind, mp[{a[i].x+2, a[i].y}]);

                if (bench[{a[i].x+1, a[i].y-1}])
                {
                    road[++ind] = {a[i].ind, mp[{a[i].x+2, a[i].y}], a[i].x+1, a[i].y+1};
                    bench[{a[i].x+1, a[i].y+1}] = 1;
                }
                else
                {
                    road[++ind] = {a[i].ind, mp[{a[i].x+2, a[i].y}], a[i].x+1, a[i].y-1};
                    bench[{a[i].x+1, a[i].y-1}] = 1;
                }
            }
        }

        if (ind != n-1) return 0;

        vector<int> U, V, A, B;

        for (int i = 1; i < n; i++)
        {
            U.push_back(road[i].u-1), V.push_back(road[i].v-1);
            A.push_back(road[i].x), B.push_back(road[i].y);
        }

        build(U, V, A, B);
        return 1;
    }

    map<pair<int, int>, int> bench;

    int ind = 0;

    queue<int> fila;
    fila.push(1), mark[1] = 1;

    while (!fila.empty())
    {
        int i = fila.front(); fila.pop();

        for (int j = 0; j < 4; j++)
        {
            int dx = a[i].x+linha[j], dy = a[i].y+coluna[j];

            if (!mp[{dx, dy}]) continue;

            int o = mp[{dx, dy}];

            if (mark[o]) continue;

            mark[o] = 1, fila.push(o);

            if (dsu.Find(i) != dsu.Find(o) && a[i].x == a[o].x && a[i].y+2 == a[o].y)
            {
                dsu.Join(i, o);

                road[++ind] = {i, o, a[i].x-1, a[i].y+1};

                if (bench[{a[i].x-1, a[i].y+1}] == 1)
                {
                    road[ind].x = a[i].x+1, road[ind].y = a[i].y+1;
                    bench[{a[i].x+1, a[i].y+1}] = 1;
                }
                else
                {
                    bench[{a[i].x-1, a[i].y+1}] = 1;
                }
            }

            if (dsu.Find(i) != dsu.Find(o) && a[i].x+2 == a[o].x)
            {
                dsu.Join(i, o);

                if (bench[{a[i].x+1, a[i].y-1}])
                {
                    road[++ind] = {i, o, a[i].x+1, a[i].y+1};
                    bench[{a[i].x+1, a[i].y+1}] = 1;
                }
                else
                {
                    road[++ind] = {i, o, a[i].x+1, a[i].y-1};
                    bench[{a[i].x+1, a[i].y-1}] = 1;
                }
            }
        }
    }

    if (ind != n-1) return 0;

    vector<int> U, V, A, B;

    for (int i = 1; i < n; i++)
    {
        U.push_back(road[i].u-1), V.push_back(road[i].v-1);
        A.push_back(road[i].x), B.push_back(road[i].y);
    }

    build(U, V, A, B);
    return 1;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 196 ms 28672 KB Output is correct
10 Correct 13 ms 3276 KB Output is correct
11 Correct 81 ms 15596 KB Output is correct
12 Correct 20 ms 4804 KB Output is correct
13 Correct 46 ms 10600 KB Output is correct
14 Correct 1 ms 460 KB Output is correct
15 Correct 2 ms 716 KB Output is correct
16 Correct 182 ms 28532 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 196 ms 28672 KB Output is correct
10 Correct 13 ms 3276 KB Output is correct
11 Correct 81 ms 15596 KB Output is correct
12 Correct 20 ms 4804 KB Output is correct
13 Correct 46 ms 10600 KB Output is correct
14 Correct 1 ms 460 KB Output is correct
15 Correct 2 ms 716 KB Output is correct
16 Correct 182 ms 28532 KB Output is correct
17 Correct 0 ms 204 KB Output is correct
18 Correct 0 ms 204 KB Output is correct
19 Correct 0 ms 204 KB Output is correct
20 Correct 0 ms 204 KB Output is correct
21 Correct 0 ms 204 KB Output is correct
22 Correct 1 ms 204 KB Output is correct
23 Correct 476 ms 50484 KB Output is correct
24 Correct 0 ms 204 KB Output is correct
25 Correct 2 ms 588 KB Output is correct
26 Correct 4 ms 928 KB Output is correct
27 Correct 5 ms 1100 KB Output is correct
28 Correct 154 ms 20492 KB Output is correct
29 Correct 250 ms 30516 KB Output is correct
30 Correct 353 ms 40476 KB Output is correct
31 Correct 456 ms 50476 KB Output is correct
32 Correct 1 ms 204 KB Output is correct
33 Correct 0 ms 204 KB Output is correct
34 Correct 0 ms 204 KB Output is correct
35 Correct 0 ms 204 KB Output is correct
36 Correct 0 ms 204 KB Output is correct
37 Correct 0 ms 204 KB Output is correct
38 Correct 0 ms 204 KB Output is correct
39 Correct 1 ms 204 KB Output is correct
40 Correct 1 ms 204 KB Output is correct
41 Correct 0 ms 204 KB Output is correct
42 Correct 0 ms 204 KB Output is correct
43 Correct 2 ms 716 KB Output is correct
44 Correct 3 ms 844 KB Output is correct
45 Correct 187 ms 27040 KB Output is correct
46 Correct 290 ms 39024 KB Output is correct
47 Correct 290 ms 39068 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 196 ms 28672 KB Output is correct
10 Correct 13 ms 3276 KB Output is correct
11 Correct 81 ms 15596 KB Output is correct
12 Correct 20 ms 4804 KB Output is correct
13 Correct 46 ms 10600 KB Output is correct
14 Correct 1 ms 460 KB Output is correct
15 Correct 2 ms 716 KB Output is correct
16 Correct 182 ms 28532 KB Output is correct
17 Correct 0 ms 204 KB Output is correct
18 Correct 0 ms 204 KB Output is correct
19 Correct 0 ms 204 KB Output is correct
20 Correct 0 ms 204 KB Output is correct
21 Correct 0 ms 204 KB Output is correct
22 Correct 1 ms 204 KB Output is correct
23 Correct 476 ms 50484 KB Output is correct
24 Correct 0 ms 204 KB Output is correct
25 Correct 2 ms 588 KB Output is correct
26 Correct 4 ms 928 KB Output is correct
27 Correct 5 ms 1100 KB Output is correct
28 Correct 154 ms 20492 KB Output is correct
29 Correct 250 ms 30516 KB Output is correct
30 Correct 353 ms 40476 KB Output is correct
31 Correct 456 ms 50476 KB Output is correct
32 Correct 1 ms 204 KB Output is correct
33 Correct 0 ms 204 KB Output is correct
34 Correct 0 ms 204 KB Output is correct
35 Correct 0 ms 204 KB Output is correct
36 Correct 0 ms 204 KB Output is correct
37 Correct 0 ms 204 KB Output is correct
38 Correct 0 ms 204 KB Output is correct
39 Correct 1 ms 204 KB Output is correct
40 Correct 1 ms 204 KB Output is correct
41 Correct 0 ms 204 KB Output is correct
42 Correct 0 ms 204 KB Output is correct
43 Correct 2 ms 716 KB Output is correct
44 Correct 3 ms 844 KB Output is correct
45 Correct 187 ms 27040 KB Output is correct
46 Correct 290 ms 39024 KB Output is correct
47 Correct 290 ms 39068 KB Output is correct
48 Correct 0 ms 204 KB Output is correct
49 Correct 0 ms 204 KB Output is correct
50 Correct 0 ms 204 KB Output is correct
51 Correct 0 ms 204 KB Output is correct
52 Correct 0 ms 204 KB Output is correct
53 Correct 0 ms 204 KB Output is correct
54 Correct 0 ms 204 KB Output is correct
55 Correct 455 ms 48420 KB Output is correct
56 Correct 0 ms 204 KB Output is correct
57 Correct 3 ms 716 KB Output is correct
58 Correct 9 ms 1796 KB Output is correct
59 Correct 14 ms 2160 KB Output is correct
60 Correct 197 ms 24372 KB Output is correct
61 Correct 331 ms 32816 KB Output is correct
62 Correct 377 ms 40092 KB Output is correct
63 Correct 480 ms 48372 KB Output is correct
64 Correct 1 ms 204 KB Output is correct
65 Correct 0 ms 204 KB Output is correct
66 Correct 0 ms 204 KB Output is correct
67 Correct 462 ms 56768 KB Output is correct
68 Correct 430 ms 56836 KB Output is correct
69 Correct 427 ms 56488 KB Output is correct
70 Correct 5 ms 1100 KB Output is correct
71 Correct 9 ms 1996 KB Output is correct
72 Correct 188 ms 26780 KB Output is correct
73 Correct 322 ms 39944 KB Output is correct
74 Correct 444 ms 53116 KB Output is correct
75 Correct 454 ms 51740 KB Output is correct
76 Correct 424 ms 56736 KB Output is correct
77 Correct 6 ms 1356 KB Output is correct
78 Correct 11 ms 2244 KB Output is correct
79 Correct 190 ms 26484 KB Output is correct
80 Correct 344 ms 39696 KB Output is correct
81 Correct 454 ms 52636 KB Output is correct

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 196 ms 28672 KB Output is correct
10 Correct 13 ms 3276 KB Output is correct
11 Correct 81 ms 15596 KB Output is correct
12 Correct 20 ms 4804 KB Output is correct
13 Correct 46 ms 10600 KB Output is correct
14 Correct 1 ms 460 KB Output is correct
15 Correct 2 ms 716 KB Output is correct
16 Correct 182 ms 28532 KB Output is correct
17 Incorrect 0 ms 204 KB Solution announced impossible, but it is possible.
18 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 196 ms 28672 KB Output is correct
10 Correct 13 ms 3276 KB Output is correct
11 Correct 81 ms 15596 KB Output is correct
12 Correct 20 ms 4804 KB Output is correct
13 Correct 46 ms 10600 KB Output is correct
14 Correct 1 ms 460 KB Output is correct
15 Correct 2 ms 716 KB Output is correct
16 Correct 182 ms 28532 KB Output is correct
17 Incorrect 517 ms 45660 KB Solution announced impossible, but it is possible.
18 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 196 ms 28672 KB Output is correct
10 Correct 13 ms 3276 KB Output is correct
11 Correct 81 ms 15596 KB Output is correct
12 Correct 20 ms 4804 KB Output is correct
13 Correct 46 ms 10600 KB Output is correct
14 Correct 1 ms 460 KB Output is correct
15 Correct 2 ms 716 KB Output is correct
16 Correct 182 ms 28532 KB Output is correct
17 Correct 0 ms 204 KB Output is correct
18 Correct 0 ms 204 KB Output is correct
19 Correct 0 ms 204 KB Output is correct
20 Correct 0 ms 204 KB Output is correct
21 Correct 0 ms 204 KB Output is correct
22 Correct 1 ms 204 KB Output is correct
23 Correct 476 ms 50484 KB Output is correct
24 Correct 0 ms 204 KB Output is correct
25 Correct 2 ms 588 KB Output is correct
26 Correct 4 ms 928 KB Output is correct
27 Correct 5 ms 1100 KB Output is correct
28 Correct 154 ms 20492 KB Output is correct
29 Correct 250 ms 30516 KB Output is correct
30 Correct 353 ms 40476 KB Output is correct
31 Correct 456 ms 50476 KB Output is correct
32 Correct 1 ms 204 KB Output is correct
33 Correct 0 ms 204 KB Output is correct
34 Correct 0 ms 204 KB Output is correct
35 Correct 0 ms 204 KB Output is correct
36 Correct 0 ms 204 KB Output is correct
37 Correct 0 ms 204 KB Output is correct
38 Correct 0 ms 204 KB Output is correct
39 Correct 1 ms 204 KB Output is correct
40 Correct 1 ms 204 KB Output is correct
41 Correct 0 ms 204 KB Output is correct
42 Correct 0 ms 204 KB Output is correct
43 Correct 2 ms 716 KB Output is correct
44 Correct 3 ms 844 KB Output is correct
45 Correct 187 ms 27040 KB Output is correct
46 Correct 290 ms 39024 KB Output is correct
47 Correct 290 ms 39068 KB Output is correct
48 Correct 0 ms 204 KB Output is correct
49 Correct 0 ms 204 KB Output is correct
50 Correct 0 ms 204 KB Output is correct
51 Correct 0 ms 204 KB Output is correct
52 Correct 0 ms 204 KB Output is correct
53 Correct 0 ms 204 KB Output is correct
54 Correct 0 ms 204 KB Output is correct
55 Correct 455 ms 48420 KB Output is correct
56 Correct 0 ms 204 KB Output is correct
57 Correct 3 ms 716 KB Output is correct
58 Correct 9 ms 1796 KB Output is correct
59 Correct 14 ms 2160 KB Output is correct
60 Correct 197 ms 24372 KB Output is correct
61 Correct 331 ms 32816 KB Output is correct
62 Correct 377 ms 40092 KB Output is correct
63 Correct 480 ms 48372 KB Output is correct
64 Correct 1 ms 204 KB Output is correct
65 Correct 0 ms 204 KB Output is correct
66 Correct 0 ms 204 KB Output is correct
67 Correct 462 ms 56768 KB Output is correct
68 Correct 430 ms 56836 KB Output is correct
69 Correct 427 ms 56488 KB Output is correct
70 Correct 5 ms 1100 KB Output is correct
71 Correct 9 ms 1996 KB Output is correct
72 Correct 188 ms 26780 KB Output is correct
73 Correct 322 ms 39944 KB Output is correct
74 Correct 444 ms 53116 KB Output is correct
75 Correct 454 ms 51740 KB Output is correct
76 Correct 424 ms 56736 KB Output is correct
77 Correct 6 ms 1356 KB Output is correct
78 Correct 11 ms 2244 KB Output is correct
79 Correct 190 ms 26484 KB Output is correct
80 Correct 344 ms 39696 KB Output is correct
81 Correct 454 ms 52636 KB Output is correct
82 Incorrect 0 ms 204 KB Solution announced impossible, but it is possible.
83 Halted 0 ms 0 KB -