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Submission #514974

# Submission time Handle Problem Language Result Execution time Memory
514974 2022-01-19T00:03:22 Z Tizariox Mecho (IOI09_mecho) C++14
0 / 100
 1000 ms 47468 KB 
#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using pii = pair<int, int>;

#define FOR(i, a, b) for (int i = a; i < (b); i++)
#define F0R(i, a) for (int i = 0; i < (a); i++)
#define F0R1(i, a) for (int i = 1; i <= (a); i++)
#define FORd(i, a, b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i, a) for (int i = (a)-1; i >= 0; i--)
#define F0Rd1(i, a) for (int i = a; i > 0; i--)
#define SORT(vec) sort(vec.begin(), vec.end())
#define S0RT(arr, n) sort(arr, arr + n)

#define pA first
#define pB second
#define MOD 1000000007
#define nl "\n"
#define pb push_back

int n, steps, rootX, rootY, homeX, homeY;

vector<pii> adj[800][800];
bool vis[800][800];
bool visBee[800][800];
bool blocked[800][800];
vector<pii> hives;
queue<pii> beeQueue;
int initialDist = 0;

void moveBees() {
	int sz = beeQueue.size();
	FOR(i, 0, sz) {
		pii node = beeQueue.front();
		beeQueue.pop();
		for (pii neighbor : adj[node.pA][node.pB]) {
			if (neighbor.pA == homeX && neighbor.pB == homeY) {
				continue;
			}
			if (!visBee[neighbor.pA][neighbor.pB]) {
				visBee[neighbor.pA][neighbor.pB] = true;
				beeQueue.push(neighbor);
			}
		}
	}
}

bool bfs(int eatHoney) {
	FOR(i, 0, n) {
		FOR(j, 0, n) {
			vis[i][j] = false;
			visBee[i][j] = false;
		}
	}
	queue<pii> bfsQueue;
	beeQueue = queue<pii>();
	vis[rootX][rootY] = true;
	bfsQueue.push(pii(rootX, rootY));
	for (pii i : hives) {
		visBee[i.pA][i.pB] = true;
		beeQueue.push(i);
	}
	FOR(i, 0, eatHoney) { moveBees(); }
	// somehow avoid having to replace the queue with every step
	while (!bfsQueue.empty()) {
		FOR(i, 0, steps) {
			int sz = bfsQueue.size();
			FOR(j, 0, sz) {
				pii node = bfsQueue.front();
				bfsQueue.pop();
				if (visBee[node.pA][node.pB]) {
					continue;
				}
				for (pii neighbor : adj[node.pA][node.pB]) {
					if (!vis[neighbor.pA][neighbor.pB] && !visBee[neighbor.pA][neighbor.pB]) {
						vis[neighbor.pA][neighbor.pB] = true;
						if (neighbor.pA == homeX && neighbor.pB == homeY) {
							return true;
						}
						bfsQueue.push(neighbor);
					}
				}
			}
		}
		moveBees();
	}
	return false;
}

void gridAdj() {
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			if (!blocked[i][j]) {
				if (i > 0 && !blocked[i - 1][j]) {
					adj[i][j].pb(pii(i - 1, j));
				}
				if (i < n - 1 && !blocked[i + 1][j]) {
					adj[i][j].pb(pii(i + 1, j));
				}
				if (j > 0 && !blocked[i][j - 1]) {
					adj[i][j].pb(pii(i, j - 1));
				}
				if (j < n - 1 && !blocked[i][j + 1]) {
					adj[i][j].pb(pii(i, j + 1));
				}
			}
		}
	}
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin >> n >> steps;
	for (int i = 0; i < n; i++) {
		string s;
		cin >> s;
		FOR(j, 0, n) {
			if (s[j] == 'T') {
				blocked[i][j] = true;
			} else if (s[j] == 'M') {
				rootX = i;
				rootY = j;
			} else if (s[j] == 'D') {
				homeX = i;
				homeY = j;
			} else if (s[j] == 'H') {
				hives.pb(pii(i, j));
			}
		}
	}
	gridAdj();
	int l = 0;
	int r = 1e5;
	int ans = l - 1;
	while (l <= r) {
		ll mid = (r + l) / 2;
		if (bfs(mid)) {
			ans = mid;
			l = mid + 1;
		} else {
			r = mid - 1;
		}
	}
	cout << ans << nl;
}

Subtask #1
0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 15308 KB Output is correct
2 Correct 8 ms 15308 KB Output is correct
3 Correct 8 ms 15360 KB Output is correct
4 Correct 8 ms 15280 KB Output is correct
5 Correct 8 ms 15384 KB Output is correct
6 Correct 8 ms 15308 KB Output is correct
7 Execution timed out 1095 ms 47328 KB Time limit exceeded
8 Correct 8 ms 15308 KB Output is correct
9 Correct 8 ms 15392 KB Output is correct
10 Correct 8 ms 15308 KB Output is correct
11 Correct 8 ms 15308 KB Output is correct
12 Correct 9 ms 15560 KB Output is correct
13 Correct 9 ms 15564 KB Output is correct
14 Correct 9 ms 15564 KB Output is correct
15 Correct 8 ms 15308 KB Output is correct
16 Correct 8 ms 15308 KB Output is correct
17 Correct 8 ms 15308 KB Output is correct
18 Correct 8 ms 15308 KB Output is correct
19 Correct 8 ms 15436 KB Output is correct
20 Correct 9 ms 15436 KB Output is correct
21 Correct 9 ms 15448 KB Output is correct
22 Correct 8 ms 15436 KB Output is correct
23 Correct 9 ms 15436 KB Output is correct
24 Correct 9 ms 15436 KB Output is correct
25 Correct 8 ms 15564 KB Output is correct
26 Correct 10 ms 15436 KB Output is correct
27 Correct 9 ms 15564 KB Output is correct
28 Correct 9 ms 15564 KB Output is correct
29 Correct 9 ms 15564 KB Output is correct
30 Correct 9 ms 15564 KB Output is correct
31 Correct 9 ms 15564 KB Output is correct
32 Correct 9 ms 15564 KB Output is correct
33 Correct 31 ms 17996 KB Output is correct
34 Correct 32 ms 17996 KB Output is correct
35 Correct 83 ms 19980 KB Output is correct
36 Correct 40 ms 18792 KB Output is correct
37 Correct 38 ms 18764 KB Output is correct
38 Correct 161 ms 21264 KB Output is correct
39 Incorrect 47 ms 19592 KB Output isn't correct
40 Correct 46 ms 19584 KB Output is correct
41 Correct 213 ms 22704 KB Output is correct
42 Incorrect 49 ms 20452 KB Output isn't correct
43 Correct 58 ms 20428 KB Output is correct
44 Correct 273 ms 24312 KB Output is correct
45 Incorrect 52 ms 21404 KB Output isn't correct
46 Correct 67 ms 21364 KB Output is correct
47 Correct 344 ms 25980 KB Output is correct
48 Incorrect 56 ms 22340 KB Output isn't correct
49 Correct 80 ms 22416 KB Output is correct
50 Correct 412 ms 27952 KB Output is correct
51 Incorrect 64 ms 23536 KB Output isn't correct
52 Incorrect 89 ms 23496 KB Output isn't correct
53 Correct 499 ms 30060 KB Output is correct
54 Incorrect 64 ms 24696 KB Output isn't correct
55 Incorrect 90 ms 24644 KB Output isn't correct
56 Correct 582 ms 32196 KB Output is correct
57 Incorrect 66 ms 25968 KB Output isn't correct
58 Incorrect 95 ms 25932 KB Output isn't correct
59 Correct 684 ms 34608 KB Output is correct
60 Incorrect 72 ms 27228 KB Output isn't correct
61 Incorrect 96 ms 27200 KB Output isn't correct
62 Correct 825 ms 37248 KB Output is correct
63 Correct 441 ms 30660 KB Output is correct
64 Correct 440 ms 30788 KB Output is correct
65 Correct 456 ms 30660 KB Output is correct
66 Correct 494 ms 30876 KB Output is correct
67 Correct 462 ms 30828 KB Output is correct
68 Correct 583 ms 30804 KB Output is correct
69 Correct 484 ms 30800 KB Output is correct
70 Correct 540 ms 30916 KB Output is correct
71 Correct 554 ms 30732 KB Output is correct
72 Correct 614 ms 30792 KB Output is correct
73 Execution timed out 1091 ms 47288 KB Time limit exceeded
74 Execution timed out 1084 ms 47256 KB Time limit exceeded
75 Execution timed out 1091 ms 47468 KB Time limit exceeded
76 Execution timed out 1096 ms 47228 KB Time limit exceeded
77 Execution timed out 1094 ms 47172 KB Time limit exceeded
78 Execution timed out 1053 ms 47352 KB Time limit exceeded
79 Execution timed out 1066 ms 47268 KB Time limit exceeded
80 Execution timed out 1048 ms 47344 KB Time limit exceeded
81 Execution timed out 1067 ms 47272 KB Time limit exceeded
82 Execution timed out 1090 ms 47180 KB Time limit exceeded
83 Execution timed out 1097 ms 47084 KB Time limit exceeded
84 Execution timed out 1090 ms 47064 KB Time limit exceeded
85 Execution timed out 1089 ms 47044 KB Time limit exceeded
86 Execution timed out 1093 ms 47260 KB Time limit exceeded
87 Execution timed out 1070 ms 47084 KB Time limit exceeded
88 Execution timed out 1093 ms 47096 KB Time limit exceeded
89 Execution timed out 1049 ms 47300 KB Time limit exceeded
90 Execution timed out 1063 ms 47052 KB Time limit exceeded
91 Execution timed out 1058 ms 47172 KB Time limit exceeded
92 Execution timed out 1081 ms 47128 KB Time limit exceeded