oj.uz

Submission #446957

# Submission time Handle Problem Language Result Execution time Memory
446957 2021-07-24T05:19:40 Z blue Fountain Parks (IOI21_parks) C++17
55 / 100
 1113 ms 117496 KB 
#include "parks.h"
#include <vector>
#include <set>
#include <algorithm>
#include <iostream>
using namespace std;

const int maxN = 200'000;
const int MX = 1'000'000;



vector<int> fountain_edge[maxN];
vector<int> fountain_visit(maxN, 0);
int visit_count = 0;

void fountain_dfs(int u)
{
    fountain_visit[u] = 1;
    visit_count++;
    for(int v: fountain_edge[u])
    {
        if(fountain_visit[v]) continue;
        fountain_dfs(v);
    }
}






struct point
{
    int i;
    int x;
    int y;
};

bool operator < (point A, point B)
{
    if(A.x == B.x) return A.y < B.y;
    return A.x < B.x;
};


int N;
vector<int> X, Y;
set<point> fountains;

int point_index(int x, int y)
{
    set<point>::iterator it = fountains.find(point{-1, x, y});
    if(it == fountains.end()) return -1;
    else return it->i;
}





struct path
{
    int i;
    int a;
    int b;

    path(int A, int B)
    {
        a = min(A, B);
        b = max(A, B);
    }

    path(int I, int A, int B)
    {
        i = I;
        a = min(A, B);
        b = max(A, B);
    }
};

bool operator < (path P, path Q)
{
    if(P.a == Q.a) return P.b < Q.b;
    return P.a < Q.a;
}

vector<path> temp_paths;
set<path> paths;





struct bench
{
    int i;
    int x;
    int y;
};

bool operator < (bench C, bench D)
{
    if(C.x == D.x) return C.y < D.y;
    return C.x < D.x;
}


set<bench> benches;

int bench_index(int x, int y)
{
    set<bench>::iterator it = benches.find(bench{-1, x, y});
    if(it == benches.end()) return -1;
    else return it->i;
}


vector<path>* bench_edge = new vector<path>[MX];











vector<int> bench_visit(MX, 0);

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










vector<int> parent(maxN);
vector<int> siz(maxN, 1);


int getRoot(int u)
{
    int v;
    for(v = u; parent[v] != v; v = parent[v]);
    parent[u] = v;
    return v;
}

void join(int u, int v)
{
    u = getRoot(u);
    v = getRoot(v);

    if(siz[u] < siz[v]) swap(u, v);

    parent[v] = u;
    siz[u] += siz[v];
}

bool connected(int u, int v)
{
    return getRoot(u) == getRoot(v);
}








int construct_roads(vector<int> x, vector<int> y)
{
    // cerr << "check\n";
    X = x;
    Y = y;

    N = X.size();

    for(int i = 0; i < N; i++)
        fountains.insert(point{i, x[i], y[i]});







    // cerr << "check 2\n";


    for(int i = 0; i < N; i++)
    {
        int I;

        I = point_index(x[i] - 2, y[i]);
        if(I != -1)
        {
            // cerr << i << ' ' << I << '\n';

            fountain_edge[i].push_back(I);
            fountain_edge[I].push_back(i);

            temp_paths.push_back(path(i, I));

            // cerr << temp_paths.size() << '\n';
        }

        I = point_index(x[i], y[i] - 2);
        if(I != -1)
        {
            // cerr << i << ' ' << I << '\n';

            fountain_edge[i].push_back(I);
            fountain_edge[I].push_back(i);

            temp_paths.push_back(path(i, I));

            // cerr << temp_paths.size() << '\n';
        }
    }

    // cerr << temp_paths.size() << '\n';

    // cerr << "check 3\n";






    fountain_dfs(0);
    if(visit_count != N)
    {
        return 0;
    }





    int path_id = -1;
    for(path p: temp_paths)
    {
        path_id++;
            // cerr << "P -> " << path_id << ' ' << p.a <<  ' ' << p.b << '\n';
        paths.insert(path(path_id, p.a, p.b));
    }

    // cerr << "check 4\n";







    int bench_id = -1;
    for(path p: paths)
    {
        // cerr << "p = " << p.i << ' ' << p.a << ' ' << p.b << '\n';
        int x1 = X[p.a];
        int y1 = Y[p.a];

        int x2 = X[p.b];
        int y2 = Y[p.b];


        bench new_bench;

        if(x1 == x2)
        {
            if( ((x1+1) + (y1+y2)/2) % 4 == 0 )
                new_bench = bench{-1, x1+1, (y1+y2)/2};
            else
                new_bench = bench{-1, x1-1, (y1+y2)/2};
        }
        else
        {
            if( ((x1+x2)/2 + (y1+1)) % 4 == 2 )
                new_bench = bench{-1, (x1+x2)/2, y1+1};
            else
                new_bench = bench{-1, (x1+x2)/2, y1-1};
        }

        int curr_bench_index;

        // cerr << "before I\n";

        int I = bench_index(new_bench.x, new_bench.y);

        if(I == -1)
        {
            bench_id++;
            curr_bench_index = bench_id;

            new_bench.i = curr_bench_index;

            benches.insert(new_bench);
        }
        else
        {
            curr_bench_index = I;
        }

        bench_edge[curr_bench_index].push_back(p);
    }

    // cerr << "check 5\n";









    for(int i = 0; i < N; i++)
        parent[i] = i;


    for(int i = 0; i <= bench_id; i++)
    {
        sort(bench_edge[i].begin(), bench_edge[i].end(), [] (path P1, path P2)
        {
            if(X[P1.a] == X[P1.b]) return Y[P1.a] < Y[P2.a];
            else return X[P1.a] < X[P2.a];
        });
    }

    // cerr << "check 6\n";



    for(bench q: benches)
    {
        for(path z: bench_edge[q.i])
        {
            if(connected(z.a, z.b)) continue;

            U.push_back(z.a);
            V.push_back(z.b);
            A.push_back(q.x);
            B.push_back(q.y);

            join(z.a, z.b);

            break;
        }
    }



    // cerr << "check 7\n";

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

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 34636 KB Output is correct
2 Correct 17 ms 34760 KB Output is correct
3 Correct 17 ms 34636 KB Output is correct
4 Correct 16 ms 34764 KB Output is correct
5 Correct 17 ms 34664 KB Output is correct
6 Correct 17 ms 34648 KB Output is correct
7 Correct 17 ms 34640 KB Output is correct
8 Correct 17 ms 34764 KB Output is correct
9 Correct 346 ms 72424 KB Output is correct
10 Correct 34 ms 38600 KB Output is correct
11 Correct 136 ms 55020 KB Output is correct
12 Correct 45 ms 40484 KB Output is correct
13 Correct 53 ms 41344 KB Output is correct
14 Correct 17 ms 34892 KB Output is correct
15 Correct 18 ms 35000 KB Output is correct
16 Correct 302 ms 71216 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 34636 KB Output is correct
2 Correct 17 ms 34760 KB Output is correct
3 Correct 17 ms 34636 KB Output is correct
4 Correct 16 ms 34764 KB Output is correct
5 Correct 17 ms 34664 KB Output is correct
6 Correct 17 ms 34648 KB Output is correct
7 Correct 17 ms 34640 KB Output is correct
8 Correct 17 ms 34764 KB Output is correct
9 Correct 346 ms 72424 KB Output is correct
10 Correct 34 ms 38600 KB Output is correct
11 Correct 136 ms 55020 KB Output is correct
12 Correct 45 ms 40484 KB Output is correct
13 Correct 53 ms 41344 KB Output is correct
14 Correct 17 ms 34892 KB Output is correct
15 Correct 18 ms 35000 KB Output is correct
16 Correct 302 ms 71216 KB Output is correct
17 Correct 17 ms 34720 KB Output is correct
18 Correct 17 ms 34752 KB Output is correct
19 Correct 17 ms 34720 KB Output is correct
20 Correct 17 ms 34740 KB Output is correct
21 Correct 18 ms 34764 KB Output is correct
22 Correct 18 ms 34644 KB Output is correct
23 Correct 1113 ms 116716 KB Output is correct
24 Correct 17 ms 34728 KB Output is correct
25 Correct 20 ms 35148 KB Output is correct
26 Correct 19 ms 35156 KB Output is correct
27 Correct 20 ms 35268 KB Output is correct
28 Correct 351 ms 67816 KB Output is correct
29 Correct 537 ms 82956 KB Output is correct
30 Correct 775 ms 100620 KB Output is correct
31 Correct 1006 ms 116404 KB Output is correct
32 Correct 17 ms 34764 KB Output is correct
33 Correct 16 ms 34636 KB Output is correct
34 Correct 18 ms 34752 KB Output is correct
35 Correct 17 ms 34688 KB Output is correct
36 Correct 18 ms 34700 KB Output is correct
37 Correct 17 ms 34764 KB Output is correct
38 Correct 17 ms 34636 KB Output is correct
39 Correct 17 ms 34764 KB Output is correct
40 Correct 18 ms 34676 KB Output is correct
41 Correct 17 ms 34764 KB Output is correct
42 Correct 17 ms 34680 KB Output is correct
43 Correct 19 ms 34920 KB Output is correct
44 Correct 20 ms 35060 KB Output is correct
45 Correct 332 ms 71528 KB Output is correct
46 Correct 605 ms 89344 KB Output is correct
47 Correct 559 ms 89068 KB Output is correct

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 34636 KB Output is correct
2 Correct 17 ms 34760 KB Output is correct
3 Correct 17 ms 34636 KB Output is correct
4 Correct 16 ms 34764 KB Output is correct
5 Correct 17 ms 34664 KB Output is correct
6 Correct 17 ms 34648 KB Output is correct
7 Correct 17 ms 34640 KB Output is correct
8 Correct 17 ms 34764 KB Output is correct
9 Correct 346 ms 72424 KB Output is correct
10 Correct 34 ms 38600 KB Output is correct
11 Correct 136 ms 55020 KB Output is correct
12 Correct 45 ms 40484 KB Output is correct
13 Correct 53 ms 41344 KB Output is correct
14 Correct 17 ms 34892 KB Output is correct
15 Correct 18 ms 35000 KB Output is correct
16 Correct 302 ms 71216 KB Output is correct
17 Correct 17 ms 34720 KB Output is correct
18 Correct 17 ms 34752 KB Output is correct
19 Correct 17 ms 34720 KB Output is correct
20 Correct 17 ms 34740 KB Output is correct
21 Correct 18 ms 34764 KB Output is correct
22 Correct 18 ms 34644 KB Output is correct
23 Correct 1113 ms 116716 KB Output is correct
24 Correct 17 ms 34728 KB Output is correct
25 Correct 20 ms 35148 KB Output is correct
26 Correct 19 ms 35156 KB Output is correct
27 Correct 20 ms 35268 KB Output is correct
28 Correct 351 ms 67816 KB Output is correct
29 Correct 537 ms 82956 KB Output is correct
30 Correct 775 ms 100620 KB Output is correct
31 Correct 1006 ms 116404 KB Output is correct
32 Correct 17 ms 34764 KB Output is correct
33 Correct 16 ms 34636 KB Output is correct
34 Correct 18 ms 34752 KB Output is correct
35 Correct 17 ms 34688 KB Output is correct
36 Correct 18 ms 34700 KB Output is correct
37 Correct 17 ms 34764 KB Output is correct
38 Correct 17 ms 34636 KB Output is correct
39 Correct 17 ms 34764 KB Output is correct
40 Correct 18 ms 34676 KB Output is correct
41 Correct 17 ms 34764 KB Output is correct
42 Correct 17 ms 34680 KB Output is correct
43 Correct 19 ms 34920 KB Output is correct
44 Correct 20 ms 35060 KB Output is correct
45 Correct 332 ms 71528 KB Output is correct
46 Correct 605 ms 89344 KB Output is correct
47 Correct 559 ms 89068 KB Output is correct
48 Correct 17 ms 34764 KB Output is correct
49 Correct 17 ms 34728 KB Output is correct
50 Correct 17 ms 34764 KB Output is correct
51 Correct 17 ms 34648 KB Output is correct
52 Correct 19 ms 34700 KB Output is correct
53 Correct 18 ms 34764 KB Output is correct
54 Correct 17 ms 34636 KB Output is correct
55 Incorrect 1066 ms 117496 KB Given structure is not connected: There is no path between vertices 0 and 4195
56 Halted 0 ms 0 KB -

Subtask #4
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 34636 KB Output is correct
2 Correct 17 ms 34760 KB Output is correct
3 Correct 17 ms 34636 KB Output is correct
4 Correct 16 ms 34764 KB Output is correct
5 Correct 17 ms 34664 KB Output is correct
6 Correct 17 ms 34648 KB Output is correct
7 Correct 17 ms 34640 KB Output is correct
8 Correct 17 ms 34764 KB Output is correct
9 Correct 346 ms 72424 KB Output is correct
10 Correct 34 ms 38600 KB Output is correct
11 Correct 136 ms 55020 KB Output is correct
12 Correct 45 ms 40484 KB Output is correct
13 Correct 53 ms 41344 KB Output is correct
14 Correct 17 ms 34892 KB Output is correct
15 Correct 18 ms 35000 KB Output is correct
16 Correct 302 ms 71216 KB Output is correct
17 Correct 17 ms 34704 KB Output is correct
18 Correct 17 ms 34668 KB Output is correct
19 Correct 17 ms 34740 KB Output is correct
20 Correct 784 ms 111744 KB Output is correct
21 Correct 786 ms 110372 KB Output is correct
22 Correct 766 ms 109812 KB Output is correct
23 Correct 626 ms 98512 KB Output is correct
24 Correct 277 ms 51972 KB Output is correct
25 Correct 421 ms 60552 KB Output is correct
26 Correct 374 ms 60536 KB Output is correct
27 Correct 809 ms 104892 KB Output is correct
28 Correct 800 ms 104708 KB Output is correct
29 Correct 834 ms 104688 KB Output is correct
30 Correct 828 ms 104816 KB Output is correct
31 Correct 17 ms 34636 KB Output is correct
32 Correct 47 ms 39924 KB Output is correct
33 Correct 105 ms 43344 KB Output is correct
34 Correct 739 ms 110756 KB Output is correct
35 Correct 25 ms 36036 KB Output is correct
36 Correct 94 ms 41100 KB Output is correct
37 Correct 180 ms 47584 KB Output is correct
38 Correct 258 ms 63376 KB Output is correct
39 Correct 388 ms 73500 KB Output is correct
40 Correct 554 ms 85360 KB Output is correct
41 Correct 743 ms 95416 KB Output is correct
42 Correct 860 ms 105756 KB Output is correct
43 Correct 17 ms 34636 KB Output is correct
44 Correct 17 ms 34696 KB Output is correct
45 Correct 17 ms 34636 KB Output is correct
46 Correct 17 ms 34764 KB Output is correct
47 Correct 17 ms 34764 KB Output is correct
48 Correct 17 ms 34752 KB Output is correct
49 Correct 17 ms 34636 KB Output is correct
50 Correct 17 ms 34728 KB Output is correct
51 Correct 17 ms 34708 KB Output is correct
52 Correct 16 ms 34636 KB Output is correct
53 Correct 17 ms 34712 KB Output is correct
54 Correct 18 ms 35040 KB Output is correct
55 Correct 19 ms 35172 KB Output is correct
56 Correct 350 ms 71532 KB Output is correct
57 Correct 529 ms 89304 KB Output is correct
58 Correct 522 ms 89092 KB Output is correct
59 Correct 17 ms 34636 KB Output is correct
60 Correct 17 ms 34724 KB Output is correct
61 Correct 17 ms 34636 KB Output is correct
62 Correct 770 ms 109204 KB Output is correct
63 Correct 809 ms 109444 KB Output is correct
64 Correct 846 ms 109572 KB Output is correct
65 Correct 20 ms 35196 KB Output is correct
66 Correct 23 ms 35732 KB Output is correct
67 Correct 351 ms 70664 KB Output is correct
68 Correct 610 ms 90220 KB Output is correct
69 Correct 806 ms 106856 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 34636 KB Output is correct
2 Correct 17 ms 34760 KB Output is correct
3 Correct 17 ms 34636 KB Output is correct
4 Correct 16 ms 34764 KB Output is correct
5 Correct 17 ms 34664 KB Output is correct
6 Correct 17 ms 34648 KB Output is correct
7 Correct 17 ms 34640 KB Output is correct
8 Correct 17 ms 34764 KB Output is correct
9 Correct 346 ms 72424 KB Output is correct
10 Correct 34 ms 38600 KB Output is correct
11 Correct 136 ms 55020 KB Output is correct
12 Correct 45 ms 40484 KB Output is correct
13 Correct 53 ms 41344 KB Output is correct
14 Correct 17 ms 34892 KB Output is correct
15 Correct 18 ms 35000 KB Output is correct
16 Correct 302 ms 71216 KB Output is correct
17 Correct 868 ms 111304 KB Output is correct
18 Correct 933 ms 110900 KB Output is correct
19 Correct 892 ms 111708 KB Output is correct
20 Correct 1008 ms 116460 KB Output is correct
21 Correct 817 ms 101228 KB Output is correct
22 Correct 17 ms 34764 KB Output is correct
23 Correct 109 ms 46580 KB Output is correct
24 Correct 38 ms 37448 KB Output is correct
25 Correct 113 ms 44272 KB Output is correct
26 Correct 234 ms 51980 KB Output is correct
27 Correct 479 ms 74332 KB Output is correct
28 Correct 531 ms 84292 KB Output is correct
29 Correct 654 ms 95068 KB Output is correct
30 Correct 773 ms 104472 KB Output is correct
31 Correct 944 ms 114388 KB Output is correct
32 Correct 893 ms 115280 KB Output is correct
33 Correct 839 ms 110920 KB Output is correct
34 Correct 21 ms 35404 KB Output is correct
35 Correct 24 ms 35980 KB Output is correct
36 Correct 364 ms 72816 KB Output is correct
37 Correct 618 ms 93180 KB Output is correct
38 Correct 872 ms 111520 KB Output is correct

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 34636 KB Output is correct
2 Correct 17 ms 34760 KB Output is correct
3 Correct 17 ms 34636 KB Output is correct
4 Correct 16 ms 34764 KB Output is correct
5 Correct 17 ms 34664 KB Output is correct
6 Correct 17 ms 34648 KB Output is correct
7 Correct 17 ms 34640 KB Output is correct
8 Correct 17 ms 34764 KB Output is correct
9 Correct 346 ms 72424 KB Output is correct
10 Correct 34 ms 38600 KB Output is correct
11 Correct 136 ms 55020 KB Output is correct
12 Correct 45 ms 40484 KB Output is correct
13 Correct 53 ms 41344 KB Output is correct
14 Correct 17 ms 34892 KB Output is correct
15 Correct 18 ms 35000 KB Output is correct
16 Correct 302 ms 71216 KB Output is correct
17 Correct 17 ms 34720 KB Output is correct
18 Correct 17 ms 34752 KB Output is correct
19 Correct 17 ms 34720 KB Output is correct
20 Correct 17 ms 34740 KB Output is correct
21 Correct 18 ms 34764 KB Output is correct
22 Correct 18 ms 34644 KB Output is correct
23 Correct 1113 ms 116716 KB Output is correct
24 Correct 17 ms 34728 KB Output is correct
25 Correct 20 ms 35148 KB Output is correct
26 Correct 19 ms 35156 KB Output is correct
27 Correct 20 ms 35268 KB Output is correct
28 Correct 351 ms 67816 KB Output is correct
29 Correct 537 ms 82956 KB Output is correct
30 Correct 775 ms 100620 KB Output is correct
31 Correct 1006 ms 116404 KB Output is correct
32 Correct 17 ms 34764 KB Output is correct
33 Correct 16 ms 34636 KB Output is correct
34 Correct 18 ms 34752 KB Output is correct
35 Correct 17 ms 34688 KB Output is correct
36 Correct 18 ms 34700 KB Output is correct
37 Correct 17 ms 34764 KB Output is correct
38 Correct 17 ms 34636 KB Output is correct
39 Correct 17 ms 34764 KB Output is correct
40 Correct 18 ms 34676 KB Output is correct
41 Correct 17 ms 34764 KB Output is correct
42 Correct 17 ms 34680 KB Output is correct
43 Correct 19 ms 34920 KB Output is correct
44 Correct 20 ms 35060 KB Output is correct
45 Correct 332 ms 71528 KB Output is correct
46 Correct 605 ms 89344 KB Output is correct
47 Correct 559 ms 89068 KB Output is correct
48 Correct 17 ms 34764 KB Output is correct
49 Correct 17 ms 34728 KB Output is correct
50 Correct 17 ms 34764 KB Output is correct
51 Correct 17 ms 34648 KB Output is correct
52 Correct 19 ms 34700 KB Output is correct
53 Correct 18 ms 34764 KB Output is correct
54 Correct 17 ms 34636 KB Output is correct
55 Incorrect 1066 ms 117496 KB Given structure is not connected: There is no path between vertices 0 and 4195
56 Halted 0 ms 0 KB -