oj.uz

Submission #533127

# Submission time Handle Problem Language Result Execution time Memory
533127 2022-03-04T22:06:03 Z Bungmint Mecho (IOI09_mecho) C++17
81 / 100
 196 ms 4456 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 = n * n, ans = -1;
	while (l <= r) {
		int mid = (l + r) / 2;
		queue<pair<int, pii>> q;
		memset(vis, 0, sizeof(bool) * 800 * 800);
		q.push({mid, st});
		vis[st.fi][st.se] = 1;
		while (sz(q)) {
			auto [r, c] = q.front().se;
			auto tt = q.front().fi;
			q.pop();
			if (tt >= distHive[r][c]) continue;
			queue<pair<int, pii>> s;
			s.push({0, {r, c}});
			while (sz(s)) {
				auto [x, y] = s.front().se;
				auto d = s.front().fi;
				s.pop();
				if (d == S) {
					q.push({tt + 1, {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;
						s.push({d + 1, {nx, ny}});
					}
				}
			}
		}
		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
81.0 / 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 Incorrect 75 ms 4276 KB Output isn't 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 980 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 844 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 1 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 1580 KB Output is correct
34 Correct 4 ms 1484 KB Output is correct
35 Correct 17 ms 1584 KB Output is correct
36 Correct 7 ms 1768 KB Output is correct
37 Correct 4 ms 1740 KB Output is correct
38 Correct 23 ms 1740 KB Output is correct
39 Correct 8 ms 1876 KB Output is correct
40 Correct 6 ms 1872 KB Output is correct
41 Correct 45 ms 1972 KB Output is correct
42 Correct 11 ms 2124 KB Output is correct
43 Correct 9 ms 2124 KB Output is correct
44 Correct 39 ms 2228 KB Output is correct
45 Correct 11 ms 2380 KB Output is correct
46 Correct 8 ms 2484 KB Output is correct
47 Correct 43 ms 2472 KB Output is correct
48 Correct 13 ms 2780 KB Output is correct
49 Correct 9 ms 2764 KB Output is correct
50 Correct 55 ms 2788 KB Output is correct
51 Correct 15 ms 2984 KB Output is correct
52 Correct 10 ms 2988 KB Output is correct
53 Correct 92 ms 3020 KB Output is correct
54 Correct 22 ms 3404 KB Output is correct
55 Correct 12 ms 3320 KB Output is correct
56 Correct 74 ms 3404 KB Output is correct
57 Correct 20 ms 3788 KB Output is correct
58 Correct 14 ms 3660 KB Output is correct
59 Correct 106 ms 3692 KB Output is correct
60 Correct 25 ms 4172 KB Output is correct
61 Correct 18 ms 4172 KB Output is correct
62 Correct 113 ms 4292 KB Output is correct
63 Correct 128 ms 4168 KB Output is correct
64 Correct 163 ms 4180 KB Output is correct
65 Correct 196 ms 4168 KB Output is correct
66 Correct 133 ms 4172 KB Output is correct
67 Correct 143 ms 4164 KB Output is correct
68 Correct 36 ms 4088 KB Output is correct
69 Correct 35 ms 4172 KB Output is correct
70 Correct 32 ms 4172 KB Output is correct
71 Correct 46 ms 4096 KB Output is correct
72 Correct 25 ms 4104 KB Output is correct
73 Correct 29 ms 4360 KB Output is correct
74 Correct 43 ms 4444 KB Output is correct
75 Correct 79 ms 4428 KB Output is correct
76 Correct 69 ms 4428 KB Output is correct
77 Correct 56 ms 4436 KB Output is correct
78 Correct 83 ms 4412 KB Output is correct
79 Correct 41 ms 4412 KB Output is correct
80 Incorrect 58 ms 4324 KB Output isn't correct
81 Incorrect 84 ms 4412 KB Output isn't correct
82 Incorrect 56 ms 4416 KB Output isn't correct
83 Incorrect 86 ms 4376 KB Output isn't correct
84 Correct 60 ms 4376 KB Output is correct
85 Incorrect 72 ms 4376 KB Output isn't correct
86 Incorrect 79 ms 4456 KB Output isn't correct
87 Incorrect 72 ms 4372 KB Output isn't correct
88 Incorrect 70 ms 4232 KB Output isn't correct
89 Incorrect 75 ms 4304 KB Output isn't correct
90 Incorrect 90 ms 4224 KB Output isn't correct
91 Correct 67 ms 4236 KB Output is correct
92 Incorrect 79 ms 4324 KB Output isn't correct