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Submission #1084370

# Submission time Handle Problem Language Result Execution time Memory
1084370 2024-09-06T06:35:14 Z PhamKhanhHuyen Mecho (IOI09_mecho) C++14
79 / 100
 148 ms 7160 KB 
#include<bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define fi first
#define se second
#define pb push_back
using namespace std;

int n, s;
const int maxn = 1000;
const int inf = 1e9;
char a[maxn + 3][maxn + 3];
pii st, en;
int dx[4] = {0, 0, 1, -1};
int dy[4] = {1, -1, 0, 0};

bool valid(int i, int j)
{
    return (i >= 1 && j >= 1 && i <= n && j <= n);
}

bool reach(int x, int y)
{
    return x/s < y;
}

int main()
{
   // freopen("metro.in", "r", stdin);
   // freopen("metro.out", "w", stdout);
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    cin >> n >> s;
    vector<vector<int>>time(n + 3, vector<int>(n + 3, inf));

    queue<pii>q;

    for(int i = 1; i <= n; ++i)
    {
        for(int j = 1; j <= n; ++j)
        {
            cin >> a[i][j];
            if(a[i][j] == 'M') st.fi = i, st.se = j;
            else if(a[i][j] == 'D')
            {
                en.fi = i, en.se = j;
            }
            else if(a[i][j] == 'H')
            {
                q.push({i, j});
                time[i][j] = 0;
            }

        }
    }

    while(!q.empty())
    {
        int x = q.front().fi;
        int y = q.front().se;
        q.pop();
        for(int k = 0; k < 4; k++)
        {
            int i = x + dx[k];
            int j = y + dy[k];
            if(valid(i, j) && (a[i][j] == 'G' || a[i][j] == 'M') && time[i][j] == inf)
            {
                q.push({i, j});
                time[i][j] = time[x][y] + 1;
            }
        }
    }
    /*for(int i = 1; i <= n; i++)
    {
        for(int j = 1; j <= n; j++)
        {
            cout << time[i][j] << ' ';
        } cout << '\n';
    }*/
    int l = 0, r = n * n, mid, res = 0;
    while(l <= r)
    {
        mid = (l + r) / 2;
        vector<vector<int>>mecho_time(n + 3, vector<int>(n + 3, inf));
        mecho_time[st.fi][st.se] = 0;
        q.push(st);
        if(time[st.fi][st.se] <= mid){
            q.pop();
        }
        while(!q.empty()){
            int x = q.front().fi;
            int y = q.front().se;
            q.pop();
            for(int k = 0; k < 4; k++)
            {
                int i = x + dx[k];
                int j = y + dy[k];
                if(valid(i, j) && (a[i][j] == 'G' || a[i][j] == 'M') && mecho_time[i][j] == inf && reach(mecho_time[x][y] + 1, time[i][j] - mid))
                {
                    q.push({i, j});
                    mecho_time[i][j] = mecho_time[x][y] + 1;
                }
            }
        }
        bool Reach = false;
        for(int i = 0; i < 4; i++)
        {
            int nx = en.fi + dx[i], ny = en.se + dy[i];
            if(valid(nx, ny) && (a[nx][ny] == 'G' || a[nx][ny] == 'M') && reach(mecho_time[nx][ny], time[nx][ny] - mid))
            {
                Reach = true;
                break;
            }
        }
        if(Reach) {
            res = mid;
            l = mid + 1;
        }
        else r = mid - 1;
    }
    if(res)cout << res;
    else cout << -1;
}

Subtask #1
79.0 / 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 Incorrect 0 ms 348 KB Output isn't correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 66 ms 7032 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Incorrect 0 ms 348 KB Output isn't correct
14 Correct 0 ms 468 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 472 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 1 ms 356 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 0 ms 352 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 1 ms 348 KB Output is correct
28 Correct 1 ms 356 KB Output is correct
29 Correct 0 ms 352 KB Output is correct
30 Correct 0 ms 356 KB Output is correct
31 Correct 1 ms 352 KB Output is correct
32 Correct 0 ms 348 KB Output is correct
33 Correct 5 ms 1940 KB Output is correct
34 Correct 5 ms 1920 KB Output is correct
35 Correct 16 ms 1936 KB Output is correct
36 Correct 7 ms 2332 KB Output is correct
37 Correct 7 ms 2316 KB Output is correct
38 Correct 19 ms 2332 KB Output is correct
39 Correct 8 ms 2728 KB Output is correct
40 Correct 9 ms 2744 KB Output is correct
41 Correct 27 ms 2756 KB Output is correct
42 Correct 10 ms 3244 KB Output is correct
43 Correct 11 ms 3212 KB Output is correct
44 Correct 32 ms 3288 KB Output is correct
45 Correct 13 ms 3800 KB Output is correct
46 Correct 13 ms 3684 KB Output is correct
47 Correct 38 ms 3740 KB Output is correct
48 Correct 15 ms 4356 KB Output is correct
49 Correct 16 ms 4360 KB Output is correct
50 Correct 50 ms 4512 KB Output is correct
51 Correct 17 ms 4960 KB Output is correct
52 Correct 23 ms 4956 KB Output is correct
53 Correct 57 ms 4932 KB Output is correct
54 Correct 20 ms 5616 KB Output is correct
55 Correct 21 ms 5584 KB Output is correct
56 Correct 66 ms 5580 KB Output is correct
57 Correct 24 ms 6280 KB Output is correct
58 Correct 30 ms 6284 KB Output is correct
59 Correct 76 ms 6292 KB Output is correct
60 Correct 28 ms 6940 KB Output is correct
61 Correct 31 ms 6936 KB Output is correct
62 Correct 88 ms 7004 KB Output is correct
63 Incorrect 84 ms 6908 KB Output isn't correct
64 Correct 148 ms 7160 KB Output is correct
65 Correct 115 ms 7000 KB Output is correct
66 Correct 103 ms 6920 KB Output is correct
67 Correct 93 ms 6908 KB Output is correct
68 Incorrect 45 ms 7044 KB Output isn't correct
69 Correct 46 ms 7116 KB Output is correct
70 Correct 38 ms 7056 KB Output is correct
71 Correct 42 ms 7044 KB Output is correct
72 Correct 35 ms 7020 KB Output is correct
73 Correct 48 ms 7068 KB Output is correct
74 Correct 50 ms 7060 KB Output is correct
75 Correct 55 ms 7060 KB Output is correct
76 Correct 53 ms 7064 KB Output is correct
77 Correct 56 ms 7096 KB Output is correct
78 Correct 57 ms 7052 KB Output is correct
79 Correct 44 ms 7040 KB Output is correct
80 Correct 49 ms 7072 KB Output is correct
81 Correct 55 ms 7072 KB Output is correct
82 Correct 48 ms 7064 KB Output is correct
83 Incorrect 60 ms 7068 KB Output isn't correct
84 Correct 54 ms 7064 KB Output is correct
85 Correct 60 ms 7064 KB Output is correct
86 Correct 60 ms 7032 KB Output is correct
87 Correct 57 ms 7036 KB Output is correct
88 Incorrect 59 ms 7068 KB Output isn't correct
89 Correct 63 ms 7056 KB Output is correct
90 Correct 69 ms 7044 KB Output is correct
91 Correct 65 ms 7024 KB Output is correct
92 Correct 67 ms 7052 KB Output is correct