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Submission #759160

# Submission time Handle Problem Language Result Execution time Memory
759160 2023-06-15T20:00:44 Z Blagoj Mecho (IOI09_mecho) C++17
84 / 100
 138 ms 7220 KB 
#include <bits/stdc++.h>
 
using namespace std;
 
#define endl '\n'
#define ll long long
#define all(x) x.begin(), x.end()
 
ll n, s, times[802][802];
vector<string> v(802);
pair<ll, ll> st, en;
 
const ll dx[4] = {0, 0, -1, 1};
const ll dy[4] = {-1, 1, 0, 0};
 
inline bool valid(ll x, ll y) {
    return (x >= 0 && x < n && y >= 0 && y < n && v[x][y] != 'T');
}
 
bool check(ll m) {
    if (m >= times[st.first][st.second]) return 0;
    queue<pair<ll, ll>> q;
    q.push(st);
    bool vis[n + 2][n + 2];
    memset(vis, 0, sizeof(vis));
    vis[st.first][st.second] = 1;
    ll moves = 0;
    do {
        moves++;
        if (moves >= s) {
            moves = 0;
            m++;
        }
        ll sz = q.size();
        while (sz--) {
            ll x = q.front().first, y = q.front().second;
            q.pop();
            for (ll d = 0; d < 4; d++) {
                ll nx = x + dx[d], ny = y + dy[d];
                if (valid(nx, ny) && m < times[nx][ny] && !vis[nx][ny]) {
                    vis[nx][ny] = 1;
                    q.push({nx, ny});
                    if (make_pair(nx, ny) == en) return 1;
                }
            }
        }
    }
    while (q.size() > 0);
    return 0;
}
 
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n >> s;
    queue<pair<ll, ll>> h;
 
    for (ll i = 0; i < n; i++) {
        cin >> v[i];
        for (ll j = 0; j < n; j++) {
            times[i][j] = n * n + 1000;
            if (v[i][j] == 'M') st = {i, j};
            if (v[i][j] == 'H') {
                h.push({i, j});
                times[i][j] = 0;
            }
            if (v[i][j] == 'D') en = {i, j};
        }
    }
 
    ll mx = 0;
    while (h.size() > 0) {
        ll x = h.front().first, y = h.front().second;
        h.pop();
        for (ll d = 0; d < 4; d++) {
            ll nx = x + dx[d], ny = y + dy[d];
            if (valid(nx, ny) && times[x][y] + 1 < times[nx][ny]) {
                times[nx][ny] = times[x][y] + 1;
                mx = max(mx, times[nx][ny]);
                h.push({nx, ny});
            }
        }
    }
 
    ll l = 0, r = mx - 1, ans = -1;
    while (l <= r) {
		ll m = (l + r) / 2;
		if (check(m)) {
			ans = m;
			l = m + 1;
		}
		else {
			r = m - 1;
		}
	}
 
    cout << ans;
}

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Incorrect 1 ms 340 KB Output isn't correct
3 Correct 0 ms 340 KB Output is correct
4 Incorrect 0 ms 340 KB Output isn't correct
5 Correct 1 ms 340 KB Output is correct
6 Incorrect 0 ms 340 KB Output isn't correct
7 Incorrect 72 ms 6876 KB Output isn't correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Incorrect 1 ms 596 KB Output isn't correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 596 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 0 ms 340 KB Output is correct
17 Correct 0 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 0 ms 468 KB Output is correct
20 Correct 0 ms 468 KB Output is correct
21 Correct 1 ms 468 KB Output is correct
22 Correct 1 ms 468 KB Output is correct
23 Correct 1 ms 468 KB Output is correct
24 Correct 1 ms 468 KB Output is correct
25 Correct 1 ms 596 KB Output is correct
26 Correct 1 ms 596 KB Output is correct
27 Correct 1 ms 596 KB Output is correct
28 Correct 1 ms 596 KB Output is correct
29 Correct 1 ms 596 KB Output is correct
30 Correct 1 ms 596 KB Output is correct
31 Correct 1 ms 596 KB Output is correct
32 Correct 1 ms 596 KB Output is correct
33 Correct 3 ms 2772 KB Output is correct
34 Correct 3 ms 2772 KB Output is correct
35 Correct 16 ms 2804 KB Output is correct
36 Correct 3 ms 3156 KB Output is correct
37 Correct 3 ms 3168 KB Output is correct
38 Correct 20 ms 3192 KB Output is correct
39 Correct 4 ms 3540 KB Output is correct
40 Correct 4 ms 3540 KB Output is correct
41 Correct 31 ms 3540 KB Output is correct
42 Correct 4 ms 3924 KB Output is correct
43 Correct 5 ms 3924 KB Output is correct
44 Correct 32 ms 3988 KB Output is correct
45 Correct 5 ms 4376 KB Output is correct
46 Correct 5 ms 4308 KB Output is correct
47 Correct 42 ms 4436 KB Output is correct
48 Correct 6 ms 4760 KB Output is correct
49 Correct 6 ms 4820 KB Output is correct
50 Correct 51 ms 4848 KB Output is correct
51 Correct 7 ms 5236 KB Output is correct
52 Correct 6 ms 5204 KB Output is correct
53 Correct 61 ms 5204 KB Output is correct
54 Correct 7 ms 5696 KB Output is correct
55 Correct 7 ms 5664 KB Output is correct
56 Correct 67 ms 5732 KB Output is correct
57 Correct 8 ms 6100 KB Output is correct
58 Correct 9 ms 6168 KB Output is correct
59 Correct 78 ms 6200 KB Output is correct
60 Correct 10 ms 6568 KB Output is correct
61 Correct 10 ms 6612 KB Output is correct
62 Correct 138 ms 6576 KB Output is correct
63 Correct 81 ms 6664 KB Output is correct
64 Correct 131 ms 6612 KB Output is correct
65 Correct 127 ms 6568 KB Output is correct
66 Correct 92 ms 6664 KB Output is correct
67 Correct 86 ms 6660 KB Output is correct
68 Correct 33 ms 6612 KB Output is correct
69 Correct 26 ms 6712 KB Output is correct
70 Correct 29 ms 6612 KB Output is correct
71 Correct 24 ms 6616 KB Output is correct
72 Correct 20 ms 6612 KB Output is correct
73 Correct 30 ms 7116 KB Output is correct
74 Correct 49 ms 7164 KB Output is correct
75 Correct 47 ms 7124 KB Output is correct
76 Correct 49 ms 7220 KB Output is correct
77 Correct 58 ms 7160 KB Output is correct
78 Correct 56 ms 7052 KB Output is correct
79 Correct 43 ms 7088 KB Output is correct
80 Correct 46 ms 7152 KB Output is correct
81 Correct 54 ms 7156 KB Output is correct
82 Correct 41 ms 7124 KB Output is correct
83 Correct 64 ms 7080 KB Output is correct
84 Correct 57 ms 6984 KB Output is correct
85 Correct 52 ms 6980 KB Output is correct
86 Correct 76 ms 7072 KB Output is correct
87 Correct 59 ms 6996 KB Output is correct
88 Correct 65 ms 6980 KB Output is correct
89 Correct 66 ms 6980 KB Output is correct
90 Correct 68 ms 6972 KB Output is correct
91 Correct 67 ms 6996 KB Output is correct
92 Correct 66 ms 6892 KB Output is correct