oj.uz

Submission #815977

# Submission time Handle Problem Language Result Execution time Memory
815977 2023-08-09T03:08:56 Z Asamai Mecho (IOI09_mecho) C++17
31 / 100
 359 ms 10824 KB 
#include <bits/stdc++.h>

using namespace std;

template<class A, class B> bool maximize(A& x, B y) {if (x < y) return x = y, true; else return false;}
template<class A, class B> bool minimize(A& x, B y) {if (x > y) return x = y, true; else return false;}

#define     all(a)                a.begin(), a.end()
#define     pb                    push_back
#define     pf                    push_front
#define     fi                    first
#define     se                    second

typedef     long long             ll;
typedef     unsigned long long    ull;
typedef     double                db;
typedef     long double           ld;
typedef     pair<db, db>          pdb;
typedef     pair<ld, ld>          pld;
typedef     pair<int, int>        pii;
typedef     pair<ll, ll>          pll;
typedef     pair<ll, int>         plli;
typedef     pair<int, ll>         pill;

const int MAX_N = 800 + 5;
const int dx[] = {0, 0, 1, -1};
const int dy[] = {1, -1, 0, 0};

int n, S;
string a[MAX_N];
pii s, t;
int dist[MAX_N][MAX_N];
bool ok[MAX_N][MAX_N];

bool inside(int x, int y) {
	return x > 0 && x <= n && y > 0 && y <= n;
}

bool check(int mid) {
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= n; j++) {
			ok[i][j] = false;
		}
	}

	queue<pair<pii, int>> q;
	q.push({s, mid + 1});
	ok[s.fi][s.se] = true;
	while (!q.empty()) {
		int u = q.front().fi.fi;
		int v = q.front().fi.se;
		int time = q.front().se;

		q.pop();

		queue<pii> nxt_q;
		for (int k = 0; k < 4; k++) {
			int x = u + dx[k];
			int y = v + dy[k];

			if (inside(x, y) && (a[x][y] == 'G' || a[x][y] == 'D') && !ok[x][y] && dist[x][y] > time) {
				ok[x][y] = true;
				nxt_q.push({x, y});
			}
		}

		vector<pii> used;
		while (!nxt_q.empty()) {
			int nxt_u = nxt_q.front().fi;
			int nxt_v = nxt_q.front().se;

			nxt_q.pop();

			if (abs(nxt_u - u) + abs(nxt_v - v) == S) {
				used.pb({nxt_u, nxt_v});
				continue;
			}

			for (int k = 0; k < 4; k++) {
				int x = nxt_u + dx[k];
				int y = nxt_v + dy[k];
				if (inside(x, y) && (a[x][y] == 'G' || a[x][y] == 'D') && !ok[x][y] && dist[x][y] > time) {
					ok[x][y] = true;
					nxt_q.push({x, y});
					used.pb({x, y});
				}
			}
		}

		for (auto it : used) {
			q.push({it, time + 1});
		}
	}

	// for (int i = 1; i <= n; i++) {
	// 	for (int j = 1; j <= n; j++) {
	// 		cout << ok[i][j] << " ";
	// 	}
	// 	cout << '\n';
	// }

	return ok[t.fi][t.se];
}

signed main() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);

	queue<pii> q;
	cin >> n >> S;
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
		a[i] = ' ' + a[i];
		for (int j = 1; j <= n; j++) {
			if (a[i][j] == 'M') {
				s = {i, j};
			}
			if (a[i][j] == 'D') {
				t = {i, j};
			}
			if (a[i][j] == 'H') {
				q.push({i, j});
				dist[i][j] = 1;
			}
		}
	}
	dist[t.fi][t.se] = 1e9;

	while (!q.empty()) {
		int u = q.front().fi;
		int v = q.front().se;
		q.pop();
		for (int k = 0; k < 4; k++) {
			int x = u + dx[k];
			int y = v + dy[k];
			if (inside(x, y) && (a[x][y] == 'G' || a[x][y] == 'M') && !dist[x][y]) {
				dist[x][y] = dist[u][v] + 1;
				q.push({x, y});
			}
		}
	}

	// for (int i = 1; i <= n; i++) {
	// 	for (int j = 1; j <= n; j++) {
	// 		cout << dist[i][j] << " ";
	// 	}
	// 	cout << '\n';
	// }

	// cout << check(2);
	// return 0;

	int low = 1, high = dist[s.fi][s.se] - 2;
	int ans = -1;
	while (low <= high) {
		int mid = (low + high) >> 1;
		if (check(mid)) {
			ans = mid;
			low = mid + 1;
		}
		else {
			high = mid - 1;
		}
	}

	cout << ans;

	return 0;
}

/*


*/

Subtask #1
31.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 340 KB Output isn't correct
2 Incorrect 0 ms 340 KB Output isn't correct
3 Incorrect 0 ms 340 KB Output isn't correct
4 Incorrect 1 ms 340 KB Output isn't correct
5 Incorrect 0 ms 340 KB Output isn't correct
6 Incorrect 0 ms 340 KB Output isn't correct
7 Correct 183 ms 4484 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 0 ms 596 KB Output is correct
13 Incorrect 1 ms 468 KB Output isn't correct
14 Correct 1 ms 596 KB Output is correct
15 Incorrect 0 ms 340 KB Output isn't correct
16 Correct 1 ms 340 KB Output is correct
17 Incorrect 1 ms 340 KB Output isn't correct
18 Correct 1 ms 468 KB Output is correct
19 Incorrect 1 ms 468 KB Output isn't correct
20 Correct 1 ms 484 KB Output is correct
21 Incorrect 0 ms 468 KB Output isn't correct
22 Correct 1 ms 464 KB Output is correct
23 Incorrect 1 ms 468 KB Output isn't correct
24 Correct 1 ms 468 KB Output is correct
25 Incorrect 1 ms 596 KB Output isn't correct
26 Correct 1 ms 596 KB Output is correct
27 Incorrect 1 ms 596 KB Output isn't correct
28 Correct 1 ms 596 KB Output is correct
29 Incorrect 1 ms 596 KB Output isn't correct
30 Correct 1 ms 596 KB Output is correct
31 Incorrect 1 ms 596 KB Output isn't correct
32 Correct 1 ms 596 KB Output is correct
33 Incorrect 5 ms 1876 KB Output isn't correct
34 Correct 8 ms 1868 KB Output is correct
35 Incorrect 68 ms 2640 KB Output isn't correct
36 Incorrect 6 ms 2112 KB Output isn't correct
37 Correct 13 ms 2132 KB Output is correct
38 Incorrect 77 ms 3200 KB Output isn't correct
39 Incorrect 8 ms 2348 KB Output isn't correct
40 Correct 12 ms 2260 KB Output is correct
41 Incorrect 90 ms 3856 KB Output isn't correct
42 Incorrect 9 ms 2592 KB Output isn't correct
43 Correct 13 ms 2636 KB Output is correct
44 Incorrect 117 ms 4360 KB Output isn't correct
45 Incorrect 11 ms 2772 KB Output isn't correct
46 Correct 17 ms 2896 KB Output is correct
47 Incorrect 141 ms 5244 KB Output isn't correct
48 Incorrect 13 ms 3028 KB Output isn't correct
49 Correct 19 ms 3152 KB Output is correct
50 Incorrect 185 ms 5932 KB Output isn't correct
51 Incorrect 21 ms 3372 KB Output isn't correct
52 Correct 33 ms 3412 KB Output is correct
53 Incorrect 206 ms 6596 KB Output isn't correct
54 Incorrect 24 ms 3632 KB Output isn't correct
55 Correct 37 ms 3668 KB Output is correct
56 Incorrect 248 ms 7068 KB Output isn't correct
57 Incorrect 20 ms 3796 KB Output isn't correct
58 Correct 30 ms 3960 KB Output is correct
59 Incorrect 267 ms 8160 KB Output isn't correct
60 Incorrect 21 ms 4052 KB Output isn't correct
61 Correct 46 ms 4216 KB Output is correct
62 Incorrect 350 ms 9188 KB Output isn't correct
63 Incorrect 162 ms 4160 KB Output isn't correct
64 Correct 352 ms 10824 KB Output is correct
65 Incorrect 359 ms 4180 KB Output isn't correct
66 Incorrect 254 ms 4168 KB Output isn't correct
67 Correct 220 ms 4052 KB Output is correct
68 Incorrect 81 ms 4212 KB Output isn't correct
69 Correct 53 ms 4600 KB Output is correct
70 Incorrect 43 ms 4080 KB Output isn't correct
71 Incorrect 27 ms 4076 KB Output isn't correct
72 Correct 28 ms 4460 KB Output is correct
73 Correct 52 ms 4332 KB Output is correct
74 Correct 137 ms 6616 KB Output is correct
75 Incorrect 152 ms 4436 KB Output isn't correct
76 Incorrect 161 ms 4436 KB Output isn't correct
77 Incorrect 161 ms 4428 KB Output isn't correct
78 Correct 163 ms 4396 KB Output is correct
79 Correct 109 ms 6928 KB Output is correct
80 Correct 128 ms 4400 KB Output is correct
81 Correct 194 ms 4512 KB Output is correct
82 Correct 136 ms 4396 KB Output is correct
83 Incorrect 164 ms 4360 KB Output isn't correct
84 Correct 175 ms 8692 KB Output is correct
85 Correct 151 ms 4356 KB Output is correct
86 Correct 187 ms 4320 KB Output is correct
87 Correct 209 ms 4484 KB Output is correct
88 Incorrect 169 ms 4428 KB Output isn't correct
89 Correct 227 ms 8748 KB Output is correct
90 Correct 256 ms 4596 KB Output is correct
91 Correct 195 ms 4856 KB Output is correct
92 Correct 214 ms 4412 KB Output is correct