oj.uz

Submission #553458

# Submission time Handle Problem Language Result Execution time Memory
553458 2022-04-25T21:58:39 Z SharpEdged Mecho (IOI09_mecho) C++17
38 / 100
 175 ms 7092 KB 
#include <bits/stdc++.h>
 
using namespace std;
 
#define f first
#define s second
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define LSB(x) ((x) & -(x))
#define sz(x) (int)(x.size())
#define uid(a, b) uniform_int_distribution<int>(a, b)(rng)

template<class T> bool ckmin(T& a, const T& b) { return b < a ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }

typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
 
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
 
void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}
 
template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ", "; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? ", " : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifdef DEBUG
#define dbg(x...) cerr << "\e[DEBUG] "<<__func__<<": "<<__LINE__<<", [" << #x << "] = ["; _print(x);
#else
#define dbg(x...)
#endif

struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        // http://xorshift.di.unimi.it/splitmix64.c
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }

    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
    
    size_t operator()(string x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        uint64_t res = 0;
        for (int i = 0; i < sz(x); i++){
			res ^= x[i] + FIXED_RANDOM;
			res = splitmix64(res);
		}
        return res;
    }
};

const ll MOD = 1e9 + 7;
const ll INFLL = 1e18 + 5;
const int INF = 1e9 + 5;

char nl = '\n';

ll modPow(ll n, ll k){
	if (k == 0) return 1;
	ll res = modPow(n, k / 2);
	res = res * res % MOD;
	if (k & 1) return res * n % MOD;
	return res;
}

const int mxN = 51;

int dr[4] = {0, 0, 1, -1};
int dc[4] = {1, -1, 0, 0};

void TestCase(){
	int n, m;
	cin >> n >> m;
	vector<string> grid(n);
	vector<vector<int>> bad(n, vector<int>(n, INF));
	vector<vector<int>> dist(n, vector<int>(n, INF));
	pair<int, int> s, e;
	queue<pair<int, int>> q;
	for (int i = 0; i < n; i++){
		cin >> grid[i];
		for (int j = 0; j < n; j++){
			if (grid[i][j] == 'H') {
				bad[i][j] = 0;
				q.push({i, j});
			} else if (grid[i][j] == 'M'){
				s = {i, j};
			} else if (grid[i][j] == 'D'){
				e = {i, j};
			}
		}
	}
	auto inside = [&](int i, int j) -> bool { return i >= 0 && i < n && j >= 0 && j < n; };
	while (!q.empty()){
		auto now = q.front(); q.pop();
		for (int i = 0; i < 4; i++){
			int nr = now.f + dr[i];
			int nc = now.s + dc[i];
			if (!inside(nr, nc) || grid[nr][nc] != 'G') continue;
			if (bad[nr][nc] == INF){
				bad[nr][nc] = bad[now.f][now.s] + 1;
				q.push({nr, nc});
			}
		}
	}
	auto check = [&](int mins) -> bool {
		dist.assign(n, vector<int>(n, INF));
		q.push(s);
		dist[s.f][s.s] = 0;
		while (!q.empty()){
			auto now = q.front(); q.pop();
			int elap = mins + dist[now.f][now.s] / m;
			for (int i = 0; i < 4; i++){
				int nr = now.f + dr[i];
				int nc = now.s + dc[i];
				if (!inside(nr, nc) || (grid[nr][nc] != 'G' && grid[nr][nc] != 'D') || elap >= bad[nr][nc]) continue;
				if (dist[nr][nc] == INF){
					dist[nr][nc] = dist[now.f][now.s] + 1;
					q.push({nr, nc});
				}
			}
		}
		return dist[e.f][e.s] != INF;
	};
	
	int lo = 0, hi = 1e6;
	int ans = -1;
	while (lo <= hi){
		int mid = (lo + hi) / 2;
		if (check(mid)){
			lo = mid+1;
			ans = mid;
		} else {
			hi = mid-1;
		}
	}
	cout << ans << nl;
}

int main(){
	//ios_base::sync_with_stdio(0);
	//cin.tie(0);
	int T = 1;
	//cin >> T;
	while (T--){
		TestCase();
	}
	return 0;
}

Subtask #1
38.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Incorrect 1 ms 308 KB Output isn't correct
3 Incorrect 0 ms 212 KB Output isn't correct
4 Incorrect 1 ms 308 KB Output isn't correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 164 ms 6888 KB Output is correct
8 Incorrect 1 ms 212 KB Output isn't correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 308 KB Output is correct
12 Incorrect 1 ms 340 KB Output isn't correct
13 Incorrect 1 ms 304 KB Output isn't correct
14 Correct 1 ms 340 KB Output is correct
15 Incorrect 1 ms 212 KB Output isn't correct
16 Correct 1 ms 308 KB Output is correct
17 Incorrect 1 ms 212 KB Output isn't correct
18 Correct 1 ms 212 KB Output is correct
19 Incorrect 1 ms 212 KB Output isn't correct
20 Correct 1 ms 212 KB Output is correct
21 Incorrect 1 ms 212 KB Output isn't correct
22 Correct 1 ms 212 KB Output is correct
23 Incorrect 1 ms 340 KB Output isn't correct
24 Correct 1 ms 212 KB Output is correct
25 Incorrect 1 ms 304 KB Output isn't correct
26 Correct 1 ms 340 KB Output is correct
27 Incorrect 1 ms 340 KB Output isn't correct
28 Correct 1 ms 340 KB Output is correct
29 Incorrect 1 ms 340 KB Output isn't correct
30 Correct 1 ms 340 KB Output is correct
31 Incorrect 1 ms 340 KB Output isn't correct
32 Correct 1 ms 340 KB Output is correct
33 Incorrect 7 ms 1492 KB Output isn't correct
34 Correct 7 ms 1464 KB Output is correct
35 Correct 24 ms 1492 KB Output is correct
36 Incorrect 7 ms 1876 KB Output isn't correct
37 Correct 6 ms 1876 KB Output is correct
38 Correct 31 ms 1876 KB Output is correct
39 Incorrect 9 ms 2260 KB Output isn't correct
40 Correct 11 ms 2332 KB Output is correct
41 Correct 37 ms 2260 KB Output is correct
42 Incorrect 13 ms 2972 KB Output isn't correct
43 Correct 14 ms 3036 KB Output is correct
44 Correct 62 ms 3028 KB Output is correct
45 Incorrect 14 ms 3540 KB Output isn't correct
46 Correct 14 ms 3528 KB Output is correct
47 Correct 60 ms 3524 KB Output is correct
48 Incorrect 16 ms 4024 KB Output isn't correct
49 Correct 19 ms 4112 KB Output is correct
50 Correct 96 ms 4108 KB Output is correct
51 Incorrect 23 ms 4700 KB Output isn't correct
52 Correct 20 ms 4592 KB Output is correct
53 Correct 101 ms 4692 KB Output is correct
54 Incorrect 21 ms 5332 KB Output isn't correct
55 Correct 26 ms 5284 KB Output is correct
56 Correct 121 ms 5352 KB Output is correct
57 Incorrect 29 ms 6028 KB Output isn't correct
58 Correct 25 ms 5972 KB Output is correct
59 Correct 118 ms 6048 KB Output is correct
60 Incorrect 26 ms 6740 KB Output isn't correct
61 Correct 28 ms 6788 KB Output is correct
62 Correct 175 ms 6780 KB Output is correct
63 Correct 118 ms 6908 KB Output is correct
64 Correct 165 ms 6740 KB Output is correct
65 Correct 169 ms 6776 KB Output is correct
66 Incorrect 151 ms 6776 KB Output isn't correct
67 Correct 111 ms 6676 KB Output is correct
68 Correct 53 ms 6804 KB Output is correct
69 Correct 57 ms 6692 KB Output is correct
70 Correct 49 ms 6796 KB Output is correct
71 Correct 42 ms 6732 KB Output is correct
72 Incorrect 43 ms 6804 KB Output isn't correct
73 Incorrect 91 ms 7048 KB Output isn't correct
74 Correct 91 ms 7052 KB Output is correct
75 Correct 82 ms 6988 KB Output is correct
76 Correct 81 ms 7060 KB Output is correct
77 Correct 85 ms 7056 KB Output is correct
78 Correct 97 ms 7020 KB Output is correct
79 Correct 69 ms 7092 KB Output is correct
80 Correct 72 ms 7032 KB Output is correct
81 Correct 84 ms 7024 KB Output is correct
82 Correct 74 ms 7028 KB Output is correct
83 Correct 103 ms 6940 KB Output is correct
84 Correct 83 ms 6944 KB Output is correct
85 Correct 82 ms 6988 KB Output is correct
86 Correct 120 ms 6968 KB Output is correct
87 Correct 96 ms 6984 KB Output is correct
88 Correct 93 ms 6864 KB Output is correct
89 Correct 96 ms 6932 KB Output is correct
90 Correct 126 ms 6932 KB Output is correct
91 Correct 111 ms 6940 KB Output is correct
92 Correct 89 ms 6836 KB Output is correct