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Submission #1038767

# Submission time Handle Problem Language Result Execution time Memory
1038767 2024-07-30T07:21:28 Z Tepeyac Mecho (IOI09_mecho) C++11
84 / 100
 139 ms 6992 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;
}

int maxm = enj[r][c];

cout << Binary(0,  maxm);

return 0;

}

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 67 ms 6532 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 1 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 0 ms 860 KB Output is correct
29 Correct 1 ms 860 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 2980 KB Output is correct
36 Correct 6 ms 3416 KB Output is correct
37 Correct 6 ms 3420 KB Output is correct
38 Correct 22 ms 3468 KB Output is correct
39 Correct 8 ms 3856 KB Output is correct
40 Correct 7 ms 3684 KB Output is correct
41 Correct 31 ms 3676 KB Output is correct
42 Correct 9 ms 4188 KB Output is correct
43 Correct 8 ms 4188 KB Output is correct
44 Correct 36 ms 4228 KB Output is correct
45 Correct 10 ms 4444 KB Output is correct
46 Incorrect 19 ms 4660 KB Output isn't correct
47 Correct 41 ms 4472 KB Output is correct
48 Correct 12 ms 4956 KB Output is correct
49 Incorrect 17 ms 4952 KB Output isn't correct
50 Correct 56 ms 4956 KB Output is correct
51 Correct 14 ms 5464 KB Output is correct
52 Incorrect 37 ms 5592 KB Output isn't correct
53 Correct 68 ms 5468 KB Output is correct
54 Correct 15 ms 5720 KB Output is correct
55 Incorrect 34 ms 5724 KB Output isn't correct
56 Correct 72 ms 5748 KB Output is correct
57 Correct 21 ms 6236 KB Output is correct
58 Incorrect 32 ms 6236 KB Output isn't correct
59 Correct 90 ms 6108 KB Output is correct
60 Correct 20 ms 6420 KB Output is correct
61 Incorrect 40 ms 6488 KB Output isn't correct
62 Correct 91 ms 6492 KB Output is correct
63 Correct 83 ms 6488 KB Output is correct
64 Correct 139 ms 6492 KB Output is correct
65 Correct 125 ms 6600 KB Output is correct
66 Correct 109 ms 6484 KB Output is correct
67 Correct 27 ms 6492 KB Output is correct
68 Correct 40 ms 6492 KB Output is correct
69 Correct 43 ms 6640 KB Output is correct
70 Correct 32 ms 6480 KB Output is correct
71 Correct 34 ms 6444 KB Output is correct
72 Correct 33 ms 6484 KB Output is correct
73 Correct 28 ms 6748 KB Output is correct
74 Correct 51 ms 6736 KB Output is correct
75 Correct 51 ms 6992 KB Output is correct
76 Correct 62 ms 6736 KB Output is correct
77 Correct 52 ms 6704 KB Output is correct
78 Correct 25 ms 6736 KB Output is correct
79 Correct 51 ms 6748 KB Output is correct
80 Correct 53 ms 6764 KB Output is correct
81 Correct 52 ms 6868 KB Output is correct
82 Correct 49 ms 6732 KB Output is correct
83 Correct 70 ms 6748 KB Output is correct
84 Correct 64 ms 6744 KB Output is correct
85 Correct 56 ms 6736 KB Output is correct
86 Correct 57 ms 6748 KB Output is correct
87 Correct 60 ms 6740 KB Output is correct
88 Correct 66 ms 6564 KB Output is correct
89 Correct 71 ms 6740 KB Output is correct
90 Correct 65 ms 6768 KB Output is correct
91 Correct 70 ms 6748 KB Output is correct
92 Correct 77 ms 6740 KB Output is correct