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Submission #1021247

# Submission time Handle Problem Language Result Execution time Memory
1021247 2024-07-12T16:17:53 Z NguyenPhucThang Mecho (IOI09_mecho) C++14
71 / 100
 155 ms 12060 KB 
#include <bits/stdc++.h>
#define forr(i, a, b) for (int i = (a); i <= (b); i++)
#define ford(i, a, b) for (int i = (a); i >= (b); i--)
#define forf(i, a, b) for (int i = (a); i < (b); i++)
#define fi first
#define se second
#define pb push_back
#define all(v) v.begin(), v.end()
#define ll long long
#define ld long double
#define pii pair<int, int>
#define pll pair<ll, ll>
#define vi vector<int>
#define vii vector<pii>
#define mask(i) (1LL << (i))
#define bit(x, i) (((x) >> (i)) & 1)
#define bp __builtin_popcountll
#define file "test"

using namespace std;
const int base = 31;
const ll mod = 1e9 + 7;
const ll oo = 1e18;
const int N = 805;

char a[N][N];
int dx[] = {1, 0, -1, 0}, dy[] = {0, 1, 0, -1};

int M[N][N], H[N][N], d[N][N], dd[N][N], xm, ym, xd, yd, n, S;

bool check(int t){
    queue<pii> q;
    forr(i, 1, n) forr(j, 1, n) dd[i][j] = false;
    
    if (H[xm][ym] <= t) return false;
    q.push({xm, ym});   
    dd[xm][ym] = true;

    while (!q.empty()){
        pii u = q.front();
        q.pop();
        forr(i, 0, 3){
            int nx = u.fi + dx[i], ny = u.se + dy[i];
            if (1 <= nx && nx <= n && 1 <= ny && ny <= n && a[nx][ny] != 'T' && !dd[nx][ny]){
                if ((M[u.fi][u.se] + 1) / S + t < H[nx][ny]){
                    dd[nx][ny] = true;
                    q.push({nx, ny});
                }
            }
        }
    }

    forr(i, 0, 3){
        int x = xd + dx[i], y = yd + dy[i];
        if (1 <= x && x <= n && 1 <= y && y <= n && M[x][y]/S + t < H[x][y] && dd[x][y]) return true;
    }
    return false;
}

int main()
{
   ios_base::sync_with_stdio(0);
   cin.tie(0);

    cin >> n >> S;
    forr(i, 1, n) forr(j, 1, n) {
        cin >> a[i][j];
        if (a[i][j] == 'M') xm = i, ym = j;
        if (a[i][j] == 'D') xd = i, yd = j;
    }
    
    queue<pii> q;
    d[xm][ym] = 1;
    q.push({xm, ym});
    while (!q.empty()){
        pii u = q.front();
        q.pop();
        forr(i, 0, 3){
            int nx = u.fi + dx[i], ny = u.se + dy[i];
            if (1 <= nx && nx <= n && 1 <= ny && ny <= n && a[nx][ny] != 'T' && !d[nx][ny]){
                d[nx][ny] = d[u.fi][u.se] + 1;
                q.push({nx, ny});
            }
        }
    }

    forr(i, 1, n) forr(j, 1, n) M[i][j] = d[i][j] - 1;

    forr(i, 1, n) forr(j, 1, n) if (a[i][j] == 'H') q.push({i, j}), H[i][j] = 1;

    while (!q.empty()){
        pii u = q.front();
        q.pop();
        forr(i, 0, 3){
            int nx = u.fi + dx[i], ny = u.se + dy[i];
            if (1 <= nx && nx <= n && 1 <= ny && ny <= n && a[nx][ny] != 'T' && !H[nx][ny]){
                H[nx][ny] = H[u.fi][u.se] + 1;
                q.push({nx, ny});
            }
        }
    }

    forr(i, 1, n) forr(j, 1, n) if (H[i][j]) H[i][j]--;

    int l = 0, r = n*n, ans = -1;
    while (l <= r){
        int mid = (l + r) >> 1;
        if (check(mid)){
            ans = mid;
            l = mid + 1;
        }
        else r = mid - 1;
    }
    
    cout << ans << endl;
  
   return 0;
}

Subtask #1
71.0 / 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 1 ms 348 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 604 KB Output is correct
7 Correct 75 ms 12060 KB Output is correct
8 Correct 1 ms 604 KB Output is correct
9 Correct 1 ms 632 KB Output is correct
10 Correct 1 ms 604 KB Output is correct
11 Correct 1 ms 604 KB Output is correct
12 Incorrect 1 ms 1116 KB Output isn't correct
13 Correct 1 ms 1116 KB Output is correct
14 Correct 1 ms 1116 KB Output is correct
15 Correct 0 ms 720 KB Output is correct
16 Correct 0 ms 604 KB Output is correct
17 Correct 1 ms 724 KB Output is correct
18 Correct 1 ms 604 KB Output is correct
19 Correct 0 ms 860 KB Output is correct
20 Correct 1 ms 856 KB Output is correct
21 Correct 1 ms 860 KB Output is correct
22 Correct 1 ms 860 KB Output is correct
23 Correct 1 ms 1116 KB Output is correct
24 Correct 1 ms 1116 KB Output is correct
25 Correct 1 ms 1116 KB Output is correct
26 Correct 1 ms 1372 KB Output is correct
27 Correct 1 ms 1372 KB Output is correct
28 Correct 1 ms 1372 KB Output is correct
29 Correct 1 ms 1372 KB Output is correct
30 Correct 1 ms 1372 KB Output is correct
31 Correct 1 ms 1372 KB Output is correct
32 Correct 1 ms 1372 KB Output is correct
33 Correct 6 ms 5208 KB Output is correct
34 Correct 6 ms 5208 KB Output is correct
35 Incorrect 18 ms 5236 KB Output isn't correct
36 Correct 8 ms 5980 KB Output is correct
37 Correct 8 ms 5952 KB Output is correct
38 Incorrect 22 ms 5980 KB Output isn't correct
39 Correct 10 ms 6624 KB Output is correct
40 Correct 10 ms 6492 KB Output is correct
41 Incorrect 28 ms 6700 KB Output isn't correct
42 Correct 11 ms 7256 KB Output is correct
43 Correct 12 ms 7512 KB Output is correct
44 Incorrect 43 ms 7260 KB Output isn't correct
45 Correct 12 ms 7904 KB Output is correct
46 Correct 13 ms 8028 KB Output is correct
47 Incorrect 39 ms 8028 KB Output isn't correct
48 Correct 14 ms 8796 KB Output is correct
49 Correct 14 ms 8808 KB Output is correct
50 Incorrect 53 ms 8796 KB Output isn't correct
51 Correct 16 ms 9560 KB Output is correct
52 Correct 16 ms 9564 KB Output is correct
53 Incorrect 52 ms 9588 KB Output isn't correct
54 Correct 19 ms 10140 KB Output is correct
55 Correct 18 ms 10332 KB Output is correct
56 Incorrect 65 ms 10324 KB Output isn't correct
57 Correct 21 ms 10836 KB Output is correct
58 Correct 21 ms 10840 KB Output is correct
59 Incorrect 74 ms 10908 KB Output isn't correct
60 Correct 23 ms 11612 KB Output is correct
61 Correct 23 ms 11748 KB Output is correct
62 Incorrect 84 ms 11804 KB Output isn't correct
63 Correct 86 ms 11612 KB Output is correct
64 Correct 155 ms 11860 KB Output is correct
65 Correct 119 ms 11600 KB Output is correct
66 Correct 97 ms 11604 KB Output is correct
67 Correct 96 ms 11800 KB Output is correct
68 Correct 52 ms 11604 KB Output is correct
69 Correct 51 ms 11604 KB Output is correct
70 Correct 42 ms 11600 KB Output is correct
71 Correct 45 ms 11600 KB Output is correct
72 Correct 46 ms 11832 KB Output is correct
73 Correct 41 ms 11928 KB Output is correct
74 Correct 48 ms 11904 KB Output is correct
75 Correct 54 ms 11860 KB Output is correct
76 Correct 49 ms 11860 KB Output is correct
77 Correct 50 ms 11864 KB Output is correct
78 Correct 58 ms 11860 KB Output is correct
79 Correct 45 ms 11856 KB Output is correct
80 Correct 53 ms 12044 KB Output is correct
81 Correct 56 ms 11856 KB Output is correct
82 Correct 50 ms 11956 KB Output is correct
83 Correct 64 ms 11856 KB Output is correct
84 Correct 57 ms 12008 KB Output is correct
85 Correct 60 ms 11856 KB Output is correct
86 Correct 59 ms 11872 KB Output is correct
87 Correct 75 ms 11788 KB Output is correct
88 Correct 72 ms 11860 KB Output is correct
89 Correct 70 ms 11768 KB Output is correct
90 Correct 64 ms 11892 KB Output is correct
91 Correct 67 ms 11956 KB Output is correct
92 Correct 80 ms 11772 KB Output is correct