oj.uz

Submission #1038772

# Submission time Handle Problem Language Result Execution time Memory
1038772 2024-07-30T07:26:49 Z Tepeyac Mecho (IOI09_mecho) C++11
100 / 100
 143 ms 6376 KB 
#include <bits/stdc++.h>

using namespace std;

int n, s;
char ma[802][802];
int enj[802][802];
int pa[802][802];

int r, c;
int r2, c2;

int mov[4][2] = { {1, 0}, {0, 1}, {-1, 0}, {0, -1} };

bool isvalidBee(int x, int y)
{
    if(!x || !y || x > n || y > n) 
    return false;

    if(ma[x][y] == 'T' || ma[x][y] == 'D') 
    return false;

    if(enj[x][y] != -1) 
    return false;

    return true;
}

void BeeFS()
{

    queue<pair<int, int> > q;
    pair<int, int> act;
    
    for(int i = 1; i <= n; ++i)
    {
        for(int j = 1; j <= n; ++j)
        {
            if(ma[i][j] == 'H')
            {
                q.push({i, j});
            }
            else
            enj[i][j] = -1;
        }
    }

    while(!q.empty())
    {
        act = q.front();
        q.pop();

        for(int i = 0; i < 4; ++i)
        {
            int nx = act.first + mov[i][0];
            int ny = act.second + mov[i][1];

            if(isvalidBee(nx, ny))
            {
                enj[nx][ny] = enj[act.first][act.second] + s;
                q.push({nx, ny});
            }

        }

    }

}

bool isvalidMecho(int x, int y, int time)
{
    if(!x || !y || x > n || y > n) 
    return false;

    if(ma[x][y] == 'T')
    return false;

    if(ma[x][y] == 'D')
    return true;

    if(pa[x][y] != -1)
    return false;

    if(time >= enj[x][y])
    return false;

    return true;

}

bool monotone(int m)
{

    queue<pair<int, int> > q;
    pair<int, int> act;

    for( int i = 1; i <= n; i++ )
		for( int j = 1; j <= n; j++ )
			pa[i][j] = -1;

    q.push({r, c});
    pa[r][c] = m * s;

    if(enj[r][c] <= pa[r][c]) return false;

    while(!q.empty())
    {
        act = q.front();
        q.pop();

        int time = pa[act.first][act.second] + 1;

        for(int i = 0; i < 4; ++i)
        {
            int nx = act.first + mov[i][0];
            int ny = act.second + mov[i][1];

            if(isvalidMecho(nx, ny, time))
            {
                q.push({nx, ny});
                pa[nx][ny] = time;

            }
        }
    }

    return pa[r2][c2] != -1;

}

int Binary(int a, int b)
{
    while(a != b)
    {
        int m = (a + b) / 2 + 1;

        if(monotone(m))
        {
            a = m;
        }
        else
        b = m - 1;
    }
    return a;
}

int main()
{

cin.tie(0) -> sync_with_stdio(0);

cin >> n >> s;

for(int i = 1; i <= n; ++i)
{
    for(int j = 1; j <= n; ++j)
    {
        cin >> ma[i][j];
        if(ma[i][j] == 'M')
        {
            r = i, c = j;
        }
        if(ma[i][j] == 'D')
        {
            r2 = i, c2 = j;
        }
    }
}

BeeFS();

if(!monotone(0))
{
    cout << "-1\n"; return 0;
}


cout << Binary(0,  640000);

return 0;

}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 74 ms 6216 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 860 KB Output is correct
13 Correct 0 ms 604 KB Output is correct
14 Correct 1 ms 860 KB Output is correct
15 Correct 0 ms 604 KB Output is correct
16 Correct 0 ms 604 KB Output is correct
17 Correct 0 ms 604 KB Output is correct
18 Correct 0 ms 604 KB Output is correct
19 Correct 0 ms 604 KB Output is correct
20 Correct 0 ms 604 KB Output is correct
21 Correct 0 ms 604 KB Output is correct
22 Correct 0 ms 604 KB Output is correct
23 Correct 0 ms 604 KB Output is correct
24 Correct 1 ms 604 KB Output is correct
25 Correct 0 ms 860 KB Output is correct
26 Correct 0 ms 860 KB Output is correct
27 Correct 1 ms 860 KB Output is correct
28 Correct 1 ms 860 KB Output is correct
29 Correct 1 ms 856 KB Output is correct
30 Correct 1 ms 860 KB Output is correct
31 Correct 1 ms 860 KB Output is correct
32 Correct 1 ms 860 KB Output is correct
33 Correct 5 ms 2908 KB Output is correct
34 Correct 5 ms 2908 KB Output is correct
35 Correct 17 ms 2836 KB Output is correct
36 Correct 6 ms 3164 KB Output is correct
37 Correct 6 ms 3164 KB Output is correct
38 Correct 22 ms 3316 KB Output is correct
39 Correct 7 ms 3420 KB Output is correct
40 Correct 8 ms 3592 KB Output is correct
41 Correct 28 ms 3420 KB Output is correct
42 Correct 8 ms 3932 KB Output is correct
43 Correct 8 ms 3932 KB Output is correct
44 Correct 34 ms 4012 KB Output is correct
45 Correct 10 ms 4188 KB Output is correct
46 Correct 11 ms 4188 KB Output is correct
47 Correct 42 ms 4188 KB Output is correct
48 Correct 11 ms 4700 KB Output is correct
49 Correct 12 ms 4628 KB Output is correct
50 Correct 49 ms 4700 KB Output is correct
51 Correct 12 ms 4956 KB Output is correct
52 Correct 14 ms 4984 KB Output is correct
53 Correct 62 ms 4956 KB Output is correct
54 Correct 14 ms 5212 KB Output is correct
55 Correct 16 ms 5424 KB Output is correct
56 Correct 69 ms 5212 KB Output is correct
57 Correct 16 ms 5720 KB Output is correct
58 Correct 19 ms 5724 KB Output is correct
59 Correct 81 ms 5724 KB Output is correct
60 Correct 20 ms 5976 KB Output is correct
61 Correct 24 ms 6116 KB Output is correct
62 Correct 90 ms 5976 KB Output is correct
63 Correct 89 ms 5980 KB Output is correct
64 Correct 143 ms 6096 KB Output is correct
65 Correct 124 ms 5980 KB Output is correct
66 Correct 103 ms 5976 KB Output is correct
67 Correct 24 ms 5980 KB Output is correct
68 Correct 36 ms 5900 KB Output is correct
69 Correct 35 ms 5972 KB Output is correct
70 Correct 28 ms 5980 KB Output is correct
71 Correct 28 ms 6156 KB Output is correct
72 Correct 28 ms 5944 KB Output is correct
73 Correct 27 ms 6192 KB Output is correct
74 Correct 46 ms 6232 KB Output is correct
75 Correct 53 ms 6232 KB Output is correct
76 Correct 51 ms 6376 KB Output is correct
77 Correct 51 ms 6192 KB Output is correct
78 Correct 27 ms 6156 KB Output is correct
79 Correct 47 ms 6164 KB Output is correct
80 Correct 51 ms 6236 KB Output is correct
81 Correct 52 ms 6236 KB Output is correct
82 Correct 50 ms 6352 KB Output is correct
83 Correct 69 ms 6312 KB Output is correct
84 Correct 60 ms 6316 KB Output is correct
85 Correct 61 ms 6224 KB Output is correct
86 Correct 57 ms 6232 KB Output is correct
87 Correct 62 ms 6308 KB Output is correct
88 Correct 65 ms 6224 KB Output is correct
89 Correct 70 ms 6232 KB Output is correct
90 Correct 64 ms 6236 KB Output is correct
91 Correct 71 ms 6236 KB Output is correct
92 Correct 62 ms 6232 KB Output is correct