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Submission #815973

# Submission time Handle Problem Language Result Execution time Memory
815973 2023-08-09T03:06:52 Z Asamai Mecho (IOI09_mecho) C++17
31 / 100
 340 ms 8032 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});
				q.push({{x, y}, time + 1});
			}
		}

		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) {
				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});
					q.push({{x, y}, 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 1 ms 384 KB Output isn't correct
2 Incorrect 0 ms 340 KB Output isn't correct
3 Incorrect 1 ms 340 KB Output isn't correct
4 Incorrect 1 ms 340 KB Output isn't correct
5 Incorrect 1 ms 340 KB Output isn't correct
6 Incorrect 1 ms 340 KB Output isn't correct
7 Correct 159 ms 4388 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 1 ms 340 KB Output is correct
12 Correct 1 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 0 ms 340 KB Output isn't correct
18 Correct 0 ms 340 KB Output is correct
19 Incorrect 1 ms 468 KB Output isn't correct
20 Correct 1 ms 468 KB Output is correct
21 Incorrect 1 ms 468 KB Output isn't correct
22 Correct 1 ms 468 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 6 ms 1876 KB Output isn't correct
34 Correct 10 ms 1880 KB Output is correct
35 Incorrect 56 ms 2284 KB Output isn't correct
36 Incorrect 8 ms 2056 KB Output isn't correct
37 Correct 10 ms 2004 KB Output is correct
38 Incorrect 65 ms 2604 KB Output isn't correct
39 Incorrect 7 ms 2260 KB Output isn't correct
40 Correct 15 ms 2344 KB Output is correct
41 Incorrect 101 ms 2984 KB Output isn't correct
42 Incorrect 8 ms 2516 KB Output isn't correct
43 Correct 12 ms 2612 KB Output is correct
44 Incorrect 106 ms 3392 KB Output isn't correct
45 Incorrect 11 ms 2748 KB Output isn't correct
46 Correct 23 ms 2752 KB Output is correct
47 Incorrect 148 ms 3796 KB Output isn't correct
48 Incorrect 11 ms 3028 KB Output isn't correct
49 Correct 24 ms 3028 KB Output is correct
50 Incorrect 163 ms 4244 KB Output isn't correct
51 Incorrect 18 ms 3368 KB Output isn't correct
52 Correct 31 ms 3400 KB Output is correct
53 Incorrect 168 ms 4624 KB Output isn't correct
54 Incorrect 15 ms 3540 KB Output isn't correct
55 Correct 30 ms 3656 KB Output is correct
56 Incorrect 220 ms 5192 KB Output isn't correct
57 Incorrect 24 ms 3800 KB Output isn't correct
58 Correct 39 ms 3916 KB Output is correct
59 Incorrect 226 ms 5724 KB Output isn't correct
60 Incorrect 26 ms 4148 KB Output isn't correct
61 Correct 36 ms 4108 KB Output is correct
62 Incorrect 300 ms 6208 KB Output isn't correct
63 Incorrect 176 ms 4160 KB Output isn't correct
64 Correct 340 ms 8032 KB Output is correct
65 Incorrect 312 ms 4168 KB Output isn't correct
66 Incorrect 226 ms 4156 KB Output isn't correct
67 Correct 189 ms 4164 KB Output is correct
68 Incorrect 66 ms 4192 KB Output isn't correct
69 Correct 51 ms 4456 KB Output is correct
70 Incorrect 53 ms 4080 KB Output isn't correct
71 Incorrect 26 ms 4080 KB Output isn't correct
72 Correct 34 ms 4332 KB Output is correct
73 Correct 37 ms 4428 KB Output is correct
74 Correct 119 ms 5348 KB Output is correct
75 Incorrect 166 ms 4436 KB Output isn't correct
76 Incorrect 107 ms 4432 KB Output isn't correct
77 Incorrect 122 ms 4332 KB Output isn't correct
78 Correct 160 ms 4404 KB Output is correct
79 Correct 119 ms 5852 KB Output is correct
80 Correct 113 ms 4400 KB Output is correct
81 Correct 189 ms 4308 KB Output is correct
82 Correct 125 ms 4384 KB Output is correct
83 Incorrect 141 ms 4292 KB Output isn't correct
84 Correct 140 ms 5944 KB Output is correct
85 Correct 172 ms 4356 KB Output is correct
86 Correct 182 ms 4356 KB Output is correct
87 Correct 131 ms 4428 KB Output is correct
88 Incorrect 141 ms 4308 KB Output isn't correct
89 Correct 173 ms 6052 KB Output is correct
90 Correct 192 ms 4440 KB Output is correct
91 Correct 197 ms 4684 KB Output is correct
92 Correct 199 ms 4320 KB Output is correct