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Submission #858203

# Submission time Handle Problem Language Result Execution time Memory
858203 2023-10-07T15:04:40 Z BBart888 Mecho (IOI09_mecho) C++14
84 / 100
 196 ms 10668 KB 
#include <iostream>
#include <cmath>
#include <algorithm>
#include <vector>
#include <array>
#include <set>
#include <queue>
#include <map>
#include <iomanip>
#include <stack>
#include <stdio.h>      /* printf, scanf, puts, NULL */
#include <stdlib.h>     /* srand, rand */
#include <time.h> 
#include <unordered_map>
#include <string>
#include <fstream>



using namespace std;
using ll = long long;
using ld = long double;
using P = pair<ll, ll>;
using Mat = vector<vector<ll>>;

const ll MOD = 2019201997LL;
const ll FACTOR1 = 2019201913LL;
const ll FACTOR2 = 2019201949LL;
const int MAXN = 1e3 + 11;




int n, s, l, r;
char t[MAXN][MAXN];
vector<pair<int,int>>hives;
int dx[]{ 0,0,-1,1 };
int dy[]{ 1,-1,0,0 };
int dist[MAXN][MAXN];
pair<int, int> bear,house;




bool within(int x, int y)
{
    return (x >= 0 && y >= 0 && x < n&& y < n);
}

bool reached(int mecho, int bees)
{
    return mecho / s < bees;
}


void action()
{
    queue<pair<int, int>> q;
    vector<vector<int>> vis(n, vector<int>(n));

    for (auto h : hives)
    {
        q.push(h);
        vis[h.first][h.second] = true;
    }

    while (!q.empty())
    {
        int x = q.front().first;
        int y = q.front().second;
        q.pop();

        for (int d = 0; d < 4; d++)
        {
            int newX = x + dx[d];
            int newY = y + dy[d];
            if (!within(newX, newY) || (t[newX][newY] != 'G' && t[newX][newY] != 'M')
                || vis[newX][newY])
                continue;
            vis[newX][newY] = true;
            q.push({ newX,newY });
            dist[newX][newY] = dist[x][y] + 1;
        }
    }
    

}



bool check(int mins)
{
    queue<pair<int,int>> q;
    vector<vector<int>>bear_dist(n, vector<int>(n));
    vector<vector<int>> vis(n, vector<int>(n));

    q.push(bear);
    vis[bear.first][bear.second] = true;
    if (dist[bear.first][bear.second] <= mins)
        q.pop();
    while (!q.empty())
    {
        int x = q.front().first;
        int y = q.front().second;
        q.pop();
        //cout << x << " " << y << " " << bear_dist[x][y] <<" VS "<<
           // dist[x][y]<<'\n';
        for (int d = 0; d < 4; d++)
        {
            int newX = x + dx[d];
            int newY = y + dy[d];
            if (!within(newX, newY) || (t[newX][newY] != 'G' && t[newX][newY] != 'M') || (
                !reached(bear_dist[x][y]+1,dist[newX][newY]-mins)) || vis[newX][newY])
                continue;
            vis[newX][newY] = true;
            q.push({ newX,newY });
            bear_dist[newX][newY] = bear_dist[x][y] + 1;
        }

    }
    int flag = 0;

    for (int d = 0; d < 4; d++)
    {
        int Hx = house.first + dx[d];
        int Hy = house.second + dy[d];
        if (!within(Hx, Hy) || (t[Hx][Hy] != 'G' && t[Hx][Hy]!='M'))
            continue;
        if (vis[Hx][Hy] && reached(bear_dist[Hx][Hy],dist[Hx][Hy]-mins))
            flag = 1;
    }

    return flag;
}



int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);

    //freopen("lasers.in", "r", stdin);
    //freopen("lasers.out", "w", stdout);


    cin >> n >> s;

    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < n; j++)
        {
            cin >> t[i][j];
            if (t[i][j] == 'H')
                hives.push_back({ i,j });
            if (t[i][j] == 'M')
                bear = { i,j };
            if (t[i][j] == 'D')
                house = { i,j };
        }
    }


    action();

    
    int l = 0, r = n * n;
    while (l < r)
    {
        int m = (l + r + 1) / 2;
        if (check(m))
            l = m;
        else
            r = m - 1;
    }

    if (l == n * n)
        cout << -1 << '\n';
    else
        cout << l << '\n';




    return 0;
}

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 0 ms 2396 KB Output is correct
3 Correct 1 ms 2648 KB Output is correct
4 Correct 0 ms 2396 KB Output is correct
5 Correct 0 ms 2396 KB Output is correct
6 Correct 0 ms 2396 KB Output is correct
7 Correct 100 ms 10340 KB Output is correct
8 Incorrect 1 ms 2396 KB Output isn't correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 1 ms 4700 KB Output is correct
13 Correct 1 ms 2652 KB Output is correct
14 Incorrect 1 ms 2652 KB Output isn't correct
15 Correct 1 ms 2396 KB Output is correct
16 Correct 0 ms 2396 KB Output is correct
17 Correct 1 ms 2396 KB Output is correct
18 Correct 1 ms 2396 KB Output is correct
19 Correct 1 ms 2392 KB Output is correct
20 Correct 1 ms 2396 KB Output is correct
21 Correct 1 ms 2648 KB Output is correct
22 Correct 1 ms 2652 KB Output is correct
23 Correct 1 ms 2904 KB Output is correct
24 Correct 1 ms 4700 KB Output is correct
25 Correct 1 ms 2652 KB Output is correct
26 Correct 1 ms 4700 KB Output is correct
27 Correct 1 ms 2652 KB Output is correct
28 Correct 1 ms 4732 KB Output is correct
29 Correct 1 ms 2652 KB Output is correct
30 Correct 1 ms 4700 KB Output is correct
31 Correct 1 ms 2652 KB Output is correct
32 Correct 1 ms 4700 KB Output is correct
33 Correct 9 ms 4940 KB Output is correct
34 Correct 8 ms 5720 KB Output is correct
35 Correct 23 ms 4952 KB Output is correct
36 Correct 11 ms 5544 KB Output is correct
37 Correct 16 ms 6184 KB Output is correct
38 Correct 32 ms 5532 KB Output is correct
39 Correct 13 ms 6132 KB Output is correct
40 Correct 14 ms 6592 KB Output is correct
41 Correct 44 ms 6072 KB Output is correct
42 Correct 17 ms 6728 KB Output is correct
43 Correct 18 ms 6980 KB Output is correct
44 Correct 55 ms 6672 KB Output is correct
45 Correct 21 ms 7400 KB Output is correct
46 Correct 28 ms 7872 KB Output is correct
47 Correct 59 ms 7556 KB Output is correct
48 Correct 24 ms 8016 KB Output is correct
49 Correct 24 ms 7956 KB Output is correct
50 Correct 73 ms 7932 KB Output is correct
51 Correct 28 ms 8524 KB Output is correct
52 Correct 29 ms 8500 KB Output is correct
53 Correct 111 ms 8500 KB Output is correct
54 Correct 32 ms 9068 KB Output is correct
55 Correct 33 ms 9100 KB Output is correct
56 Correct 103 ms 9056 KB Output is correct
57 Correct 37 ms 9836 KB Output is correct
58 Correct 38 ms 9720 KB Output is correct
59 Correct 141 ms 9848 KB Output is correct
60 Correct 45 ms 10416 KB Output is correct
61 Correct 46 ms 10668 KB Output is correct
62 Correct 134 ms 10324 KB Output is correct
63 Correct 106 ms 10440 KB Output is correct
64 Correct 196 ms 10584 KB Output is correct
65 Correct 151 ms 10352 KB Output is correct
66 Correct 125 ms 10400 KB Output is correct
67 Incorrect 122 ms 10356 KB Output isn't correct
68 Correct 61 ms 10508 KB Output is correct
69 Correct 52 ms 10364 KB Output is correct
70 Correct 51 ms 10368 KB Output is correct
71 Correct 47 ms 10448 KB Output is correct
72 Correct 40 ms 10376 KB Output is correct
73 Correct 42 ms 10392 KB Output is correct
74 Correct 76 ms 10400 KB Output is correct
75 Correct 84 ms 10392 KB Output is correct
76 Correct 77 ms 10456 KB Output is correct
77 Correct 82 ms 10372 KB Output is correct
78 Incorrect 82 ms 10376 KB Output isn't correct
79 Correct 64 ms 10392 KB Output is correct
80 Correct 68 ms 10392 KB Output is correct
81 Correct 75 ms 10360 KB Output is correct
82 Correct 67 ms 10388 KB Output is correct
83 Correct 93 ms 10368 KB Output is correct
84 Correct 100 ms 10388 KB Output is correct
85 Correct 89 ms 10356 KB Output is correct
86 Correct 94 ms 10392 KB Output is correct
87 Correct 85 ms 10396 KB Output is correct
88 Correct 105 ms 10472 KB Output is correct
89 Correct 130 ms 10372 KB Output is correct
90 Correct 102 ms 10372 KB Output is correct
91 Correct 92 ms 10376 KB Output is correct
92 Correct 93 ms 10416 KB Output is correct