oj.uz

Submission #533134

# Submission time Handle Problem Language Result Execution time Memory
533134 2022-03-04T23:03:23 Z Bungmint Mecho (IOI09_mecho) C++17
100 / 100
 172 ms 4444 KB 
//Copyright © 2022 Youngmin Park. All rights reserved.
#pragma GCC optimize("O3")
#pragma GCC target("avx2")
#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using vi = vector<int>;
using pii = pair<int, int>;
using vpi = vector<pii>;
using pll = pair<ll, ll>;
using vl = vector<ll>;
using vpl = vector<pll>;
using ld = long double;
template <typename T, size_t SZ>
using ar = array<T, SZ>;

#define all(v) (v).begin(), (v).end()
#define pb push_back
#define sz(x) (int)(x).size()
#define fi first
#define se second
#define lb lower_bound
#define ub upper_bound
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define F0R(i, a) FOR(i, 0, a)
#define ROF(i, a, b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i, a) ROF(i, 0, a)
#define REP(a) F0R(_, a)

const int INF = 1e9;
const ll LINF = 1e18;
const int MOD = 1e9 + 7; //998244353;
const ld PI = acos((ld)-1.0);
const int dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
template <typename T>
using pqg = priority_queue<T, vector<T>, greater<T>>;
template <typename T>
inline bool ckmin(T &a, const T &b) { return b < a ? a = b, 1 : 0; }
template <typename T>
bool ckmax(T &a, const T &b) { return b > a ? a = b, 1 : 0; }

template <typename A, typename B>
ostream &operator<<(ostream &os, const pair<A, B> &p)
{
    return os << '(' << p.first << ", " << p.second << ')';
}
template <typename T_container, typename T = typename enable_if<!is_same<T_container, string>::value, typename T_container::value_type>::type>
ostream &operator<<(ostream &os, const T_container &v)
{
    os << '{';
    string sep;
    for (const T &x : v)
        os << sep << x, sep = ", ";
    return os << '}';
}
void dbg_out()
{
    cerr << endl;
}
template <typename Head, typename... Tail>
void dbg_out(Head H, Tail... T)
{
    cerr << ' ' << H;
    dbg_out(T...);
}
#ifdef LOCAL
#define dbg(...) cerr << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__)
#else
#define dbg(...) 42
#endif

inline namespace RecursiveLambda{
	template <typename Fun>
	struct y_combinator_result{
		Fun fun_;
		template <typename T> 
		explicit y_combinator_result(T &&fun): fun_(forward<T>(fun)){}
		template <typename...Args>
		decltype(auto) operator()(Args &&...args){
			return fun_(ref(*this), forward<Args>(args)...);
		}
	};
	template <typename Fun>
	decltype(auto) y_combinator(Fun &&fun){
		return y_combinator_result<decay_t<Fun>>(forward<Fun>(fun));
	}
};

void setIO(string s) // USACO
{
	#ifndef LOCAL
	    freopen((s + ".in").c_str(), "r", stdin);
	    freopen((s + ".out").c_str(), "w", stdout);
	#endif
}

bool vis[800][800];

void solve()
{
	int n, S;
	cin >> n >> S;
	vector<string> grid(n);
	for (auto &s : grid) cin >> s;
	pii st, en{};
	vector<vi> distHive(n, vi(n, INF));
	queue<pii> bee;
	F0R(i, n) F0R(j, n) {
		if (grid[i][j] == 'M') {
			st = {i, j};
		}
		if (grid[i][j] == 'H') {
			distHive[i][j] = 0;
			bee.push({i, j});
		}
		if (grid[i][j] == 'D') {
			en = {i, j};
		}
	}
	while (sz(bee)) {
		auto [r, c] = bee.front();
		bee.pop();
		F0R(i, 4) {
			int nr = r + dx[i], nc = c + dy[i];
			if (nr < 0 || nc < 0 || nr >= n || nc >= n) continue;
			if (grid[nr][nc] == 'T' || grid[nr][nc] == 'D') continue;
			if (ckmin(distHive[nr][nc], distHive[r][c] + 1)) {
				bee.push({nr, nc});
			}
		}
	}
	int l = 0, r = distHive[st.fi][st.se] - 1, ans = -1;
	while (l <= r) {
		int mid = (l + r) / 2;
		int tt = mid;
		queue<pair<int, pii>> q, nxt;
		memset(vis, 0, sizeof(bool) * 800 * 800);
		q.push({0, st});
		vis[st.fi][st.se] = 1;
		while (sz(q)) {
			while (sz(q)) {
				auto [x, y] = q.front().se;
				auto d = q.front().fi;
				q.pop();
				if (d == S) {
					if (distHive[x][y] > tt + 1) nxt.push({0, {x, y}});
					continue;
				}
				F0R(i, 4) {
					int nx = x + dx[i], ny = y + dy[i];
					if (nx < 0 || ny < 0 || nx >= n || ny >= n) continue;
					if (grid[nx][ny] == 'T') continue;
					if (distHive[nx][ny] <= tt) continue;
					if (!vis[nx][ny]) {
						vis[nx][ny] = 1;
						q.push({d + 1, {nx, ny}});
					}
				}
			}
			while (sz(nxt)) q.push({0, nxt.front().se}), nxt.pop();
			tt++;
		}
		if (vis[en.fi][en.se]) ans = mid, l = mid + 1;
		else r = mid - 1;
	}
	cout << ans;
}

int main()
{
    cin.tie(0)->sync_with_stdio(0);
    cin.exceptions(cin.failbit);
    int testcase=1;
    // cin >> testcase;
    while (testcase--)
    {
        solve();
    }
}

Compilation message

mecho.cpp: In function 'void setIO(std::string)':
mecho.cpp:94:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   94 |      freopen((s + ".in").c_str(), "r", stdin);
      |      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mecho.cpp:95:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   95 |      freopen((s + ".out").c_str(), "w", stdout);
      |      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 844 KB Output is correct
2 Correct 1 ms 844 KB Output is correct
3 Correct 1 ms 844 KB Output is correct
4 Correct 1 ms 844 KB Output is correct
5 Correct 1 ms 844 KB Output is correct
6 Correct 1 ms 844 KB Output is correct
7 Correct 73 ms 4276 KB Output is correct
8 Correct 1 ms 844 KB Output is correct
9 Correct 1 ms 844 KB Output is correct
10 Correct 1 ms 844 KB Output is correct
11 Correct 1 ms 844 KB Output is correct
12 Correct 1 ms 972 KB Output is correct
13 Correct 1 ms 972 KB Output is correct
14 Correct 1 ms 972 KB Output is correct
15 Correct 1 ms 844 KB Output is correct
16 Correct 1 ms 844 KB Output is correct
17 Correct 1 ms 844 KB Output is correct
18 Correct 1 ms 844 KB Output is correct
19 Correct 1 ms 844 KB Output is correct
20 Correct 1 ms 844 KB Output is correct
21 Correct 1 ms 844 KB Output is correct
22 Correct 1 ms 844 KB Output is correct
23 Correct 1 ms 844 KB Output is correct
24 Correct 1 ms 972 KB Output is correct
25 Correct 1 ms 972 KB Output is correct
26 Correct 1 ms 972 KB Output is correct
27 Correct 1 ms 972 KB Output is correct
28 Correct 1 ms 972 KB Output is correct
29 Correct 2 ms 972 KB Output is correct
30 Correct 1 ms 972 KB Output is correct
31 Correct 1 ms 972 KB Output is correct
32 Correct 1 ms 972 KB Output is correct
33 Correct 5 ms 1484 KB Output is correct
34 Correct 4 ms 1484 KB Output is correct
35 Correct 15 ms 1588 KB Output is correct
36 Correct 5 ms 1740 KB Output is correct
37 Correct 5 ms 1660 KB Output is correct
38 Correct 23 ms 1780 KB Output is correct
39 Correct 7 ms 1868 KB Output is correct
40 Correct 6 ms 1868 KB Output is correct
41 Correct 37 ms 1996 KB Output is correct
42 Correct 8 ms 2124 KB Output is correct
43 Correct 7 ms 2124 KB Output is correct
44 Correct 35 ms 2228 KB Output is correct
45 Correct 9 ms 2380 KB Output is correct
46 Correct 8 ms 2380 KB Output is correct
47 Correct 50 ms 2472 KB Output is correct
48 Correct 12 ms 2764 KB Output is correct
49 Correct 13 ms 2764 KB Output is correct
50 Correct 51 ms 2792 KB Output is correct
51 Correct 14 ms 3020 KB Output is correct
52 Correct 12 ms 3020 KB Output is correct
53 Correct 58 ms 3084 KB Output is correct
54 Correct 14 ms 3404 KB Output is correct
55 Correct 13 ms 3404 KB Output is correct
56 Correct 71 ms 3424 KB Output is correct
57 Correct 24 ms 3684 KB Output is correct
58 Correct 18 ms 3660 KB Output is correct
59 Correct 104 ms 3788 KB Output is correct
60 Correct 18 ms 4172 KB Output is correct
61 Correct 16 ms 4072 KB Output is correct
62 Correct 97 ms 4192 KB Output is correct
63 Correct 136 ms 4168 KB Output is correct
64 Correct 154 ms 4292 KB Output is correct
65 Correct 172 ms 4172 KB Output is correct
66 Correct 117 ms 4172 KB Output is correct
67 Correct 130 ms 4168 KB Output is correct
68 Correct 40 ms 4164 KB Output is correct
69 Correct 39 ms 4168 KB Output is correct
70 Correct 29 ms 4092 KB Output is correct
71 Correct 24 ms 4104 KB Output is correct
72 Correct 31 ms 4212 KB Output is correct
73 Correct 30 ms 4444 KB Output is correct
74 Correct 46 ms 4428 KB Output is correct
75 Correct 48 ms 4352 KB Output is correct
76 Correct 52 ms 4444 KB Output is correct
77 Correct 51 ms 4428 KB Output is correct
78 Correct 62 ms 4440 KB Output is correct
79 Correct 45 ms 4320 KB Output is correct
80 Correct 64 ms 4428 KB Output is correct
81 Correct 57 ms 4428 KB Output is correct
82 Correct 47 ms 4380 KB Output is correct
83 Correct 66 ms 4288 KB Output is correct
84 Correct 52 ms 4288 KB Output is correct
85 Correct 59 ms 4292 KB Output is correct
86 Correct 68 ms 4292 KB Output is correct
87 Correct 57 ms 4284 KB Output is correct
88 Correct 65 ms 4320 KB Output is correct
89 Correct 62 ms 4320 KB Output is correct
90 Correct 67 ms 4324 KB Output is correct
91 Correct 67 ms 4236 KB Output is correct
92 Correct 82 ms 4324 KB Output is correct