oj.uz

Submission #1011030

# Submission time Handle Problem Language Result Execution time Memory
1011030 2024-06-29T17:14:09 Z danikoynov Virus Experiment (JOI19_virus) C++14
20 / 100
 2000 ms 66576 KB 
#include<bits/stdc++.h>
#define endl '\n'

typedef long long ll;

const int MAX_R = 810;

struct Cell
{
    int x, y;
    
    Cell(int _x = 0, int _y = 0)
    {
        x = _x;
        y = _y;
    }

    Cell operator + (const Cell &c) const
    {
        return Cell(x + c.x, y + c.y);
    }
};

Cell neib[4] = {{-1, 0}, {0, 1}, {1, 0}, {0, -1}};

int m, r, c;
std::string d;

int u[MAX_R][MAX_R];
void input()
{
    std::cin >> m >> r >> c;
    std::cin >> d;
    for (int i = 1; i <= r; i ++)
        for (int j = 1; j <= c; j ++)
            std::cin >> u[i][j];
}

int get_index(int i, int j)
{
    return (i - 1) * c + j;
}


std::string dir = "NESW";

int comp[MAX_R][MAX_R];
int par[MAX_R * MAX_R];
std::vector < Cell > dsu_comp[MAX_R * MAX_R];
int used[MAX_R][MAX_R];
int lon[(1 << 4) + 1];
int is_dead[MAX_R * MAX_R];
void find_longest(int mask)
{
    int cnt = 0;
    for (int i = 0; i < m; i ++)
    {
        for (int j = 0; j < 4; j ++)
        {
            if (d[i] != dir[j])
                continue;

            if ((mask & (1 << j)) > 0)
                cnt ++;
            else
            {
                lon[mask] = std::max(lon[mask], cnt);
                cnt = 0;
            }
            
        }
    }
    if (cnt == m)
        cnt = 2e9 + 10;
    ///std::cout << cnt << endl;
    lon[mask] = std::max(lon[mask], cnt);
    cnt = 0;
}

void init()
{
    for (int i = 1; i <= r; i ++)
        for (int j = 1; j <= c; j ++)
        {
            if (u[i][j] == 0)
                continue;
            par[get_index(i, j)] = get_index(i, j);
            comp[i][j] = get_index(i, j);
            dsu_comp[get_index(i, j)].push_back(Cell(i, j));
        }

    d = d + d;
    m = 2 * m;
    for (int mask = 0; mask < (1 << 4); mask ++)
        find_longest(mask);
}   

int find_leader(int v)
{
    if (v == par[v])
        return v;
    return (par[v] = find_leader(par[v]));
}

std::pair < int, int > bfs(int s)
{
    //std::cout << "start bfs " << endl;
    for (Cell cur : dsu_comp[s])
    {
        used[cur.x][cur.y] = 0;
    }
    /**std::cout << "USED" << endl;
    for (int i = 1; i <= r; i ++, std::cout << endl)
        for (int j = 1; j <= c; j ++)
            std::cout << used[i][j] << " ";*/
    std::queue < Cell > q;
    q.push(dsu_comp[s].back());
    used[q.front().x][q.front().y] = 1;

    int cnt = 0;
    while(!q.empty())
    {
        Cell cur = q.front();
        q.pop();
        ///std::cout << "cell " << cur.x << " " << cur.y << endl;
        cnt ++;
        for (int i = 0; i < 4; i ++)
        {
            Cell nb = cur + neib[i];
            if (nb.x < 1 || nb.x > r || nb.y < 1 || nb.y > c || u[nb.x][nb.y] == 0)
                continue;
            
            int mask = 0;
            for (int j = 0; j < 4; j ++)
            {
                Cell ds = nb + neib[j];
                if (ds.x < 1 || ds.x > r || ds.y < 1 || ds.y > c)
                    continue;
                if (used[ds.x][ds.y] == 1 && find_leader(comp[ds.x][ds.y]) == s)
                    mask |= (1 << j);
            }
            ///std::cout << "neib: " << nb.x << " " << nb.y << " " << mask << " " << lon[mask] << endl; 
        
            if (lon[mask] >= u[nb.x][nb.y])
            {
                if (find_leader(get_index(nb.x, nb.y)) == s)
                {
                    if (!used[nb.x][nb.y])  
                    {   
                        used[nb.x][nb.y] = 1;
                        q.push(nb);
                    }
                }
                else
                {
                    //std::cout << "fuck here" << endl;
                    return {1, comp[nb.x][nb.y]};
                }
            }
        }
    }

    return {-1, cnt};
}

int marked[MAX_R * MAX_R];

void unite(int v, int u)
{
    v = find_leader(v);
    u = find_leader(u);
    if (v == u)
        return;
    if (is_dead[u])
        is_dead[v] = 1;
    
    if (dsu_comp[v].size() > dsu_comp[u].size())
    {
        for (Cell cur : dsu_comp[u])
        {
            dsu_comp[v].push_back(cur);
            comp[cur.x][cur.y] = v;
        }
        par[u] = v;
    }
    else
    {
        Cell spec = dsu_comp[u].back();
        dsu_comp[u].pop_back();
        for (Cell cur : dsu_comp[v])
        {
            dsu_comp[u].push_back(cur);
            comp[cur.x][cur.y] = u;
        }
        par[v] = u;
        dsu_comp[u].push_back(spec);
    }
}

void union_process()
{
    std::pair < int, int > res = {1e9, 0};

    int cycle =0 ;
    while(true)
    {
        cycle ++;
        //if (cycle == 3)
          //  break;
        std::vector < std :: pair < int, int > > edges;
        for (int i = 1; i <= r * c; i ++)
            marked[i] = 0;
        
        bool done = true;
        for (int i = 1; i <= r * c; i ++)
        {
            
            int lead = find_leader(i);
            if (lead == 0)
                continue;
            
            if (marked[lead] || is_dead[lead])
                continue;
            
            done = false;
            //std::cout << "start from " << i << endl;
            std::pair < int, int > cur = bfs(lead);
            //std::cout << "survive bfs " << cur.first << " " << cur.second << endl;
            if (cur.first == -1)
            {
                //std::cout << "kill" << endl;
                ///std::cout << "kill " << cur.second << endl;
                if (cur.second < res.first)  res = {cur.second, 0};
                if (cur.second == res.first) res.second += cur.second;
                is_dead[lead] = 1;
            }
            else
            {
                edges.push_back({i, cur.second});
            }
            ///std::cout << "out " << endl;
        }

        ///std::cout << "fine after cycle " << endl;
        if (done)
            break;
        for (std::pair < int, int > road : edges)
        {
            //std::cout << "edge " << road.first << " " << road.second << endl;
            unite(road.first, road.second);
        }
        /**for (int i = 1; i <= r; i ++, std::cout << endl)
            for (int j = 1; j <= c; j ++)
            std::cout << find_leader(comp[i][j]) << " ";*/
        //exit(0);
    }


    std::cout << res.first << endl << res.second << endl;
}
void solve()
{
    input();
    init();
    union_process();
}

void speed()
{
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);
    std::cout.tie(nullptr);
}
int main()
{
    ///freopen("test.txt", "r", stdin);
    speed();
    solve();
    return 0;
}
/**

*/

Subtask #1
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 16220 KB Output is correct
2 Correct 120 ms 60128 KB Output is correct
3 Correct 140 ms 62384 KB Output is correct
4 Correct 124 ms 62388 KB Output is correct
5 Correct 112 ms 51024 KB Output is correct
6 Correct 8 ms 21084 KB Output is correct
7 Correct 162 ms 60116 KB Output is correct
8 Correct 72 ms 30912 KB Output is correct

Subtask #2
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 15960 KB Output is correct
2 Correct 16 ms 16304 KB Output is correct
3 Correct 32 ms 16216 KB Output is correct
4 Correct 20 ms 16220 KB Output is correct
5 Correct 31 ms 16220 KB Output is correct
6 Correct 41 ms 16732 KB Output is correct
7 Correct 7 ms 15964 KB Output is correct
8 Correct 36 ms 16544 KB Output is correct
9 Correct 14 ms 16472 KB Output is correct
10 Correct 16 ms 16216 KB Output is correct
11 Correct 8 ms 16532 KB Output is correct
12 Correct 315 ms 16596 KB Output is correct
13 Correct 29 ms 16728 KB Output is correct
14 Correct 30 ms 16728 KB Output is correct
15 Correct 29 ms 16732 KB Output is correct
16 Correct 34 ms 16632 KB Output is correct
17 Correct 20 ms 16476 KB Output is correct
18 Correct 9 ms 16476 KB Output is correct
19 Correct 32 ms 16680 KB Output is correct

Subtask #3
0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 16220 KB Output is correct
2 Correct 120 ms 60128 KB Output is correct
3 Correct 140 ms 62384 KB Output is correct
4 Correct 124 ms 62388 KB Output is correct
5 Correct 112 ms 51024 KB Output is correct
6 Correct 8 ms 21084 KB Output is correct
7 Correct 162 ms 60116 KB Output is correct
8 Correct 72 ms 30912 KB Output is correct
9 Correct 7 ms 15960 KB Output is correct
10 Correct 16 ms 16304 KB Output is correct
11 Correct 32 ms 16216 KB Output is correct
12 Correct 20 ms 16220 KB Output is correct
13 Correct 31 ms 16220 KB Output is correct
14 Correct 41 ms 16732 KB Output is correct
15 Correct 7 ms 15964 KB Output is correct
16 Correct 36 ms 16544 KB Output is correct
17 Correct 14 ms 16472 KB Output is correct
18 Correct 16 ms 16216 KB Output is correct
19 Correct 8 ms 16532 KB Output is correct
20 Correct 315 ms 16596 KB Output is correct
21 Correct 29 ms 16728 KB Output is correct
22 Correct 30 ms 16728 KB Output is correct
23 Correct 29 ms 16732 KB Output is correct
24 Correct 34 ms 16632 KB Output is correct
25 Correct 20 ms 16476 KB Output is correct
26 Correct 9 ms 16476 KB Output is correct
27 Correct 32 ms 16680 KB Output is correct
28 Execution timed out 2085 ms 66576 KB Time limit exceeded
29 Halted 0 ms 0 KB -