Submission #153037

# Submission time Handle Problem Language Result Execution time Memory
153037 2019-09-11T14:28:57 Z tselmegkh Mecho (IOI09_mecho) C++14
43 / 100
274 ms 4608 KB
#include<bits/stdc++.h>
using namespace std;
 
const int N = 805, inf = 1e9;
string a[N];
int d[N][N], dis[N][N], n, s;
bool vis[N][N];
pair<int, int> st, en;
int mx = 0;
int movex[] = {1, 0, -1, 0};
int movey[] = {0, 1, 0, -1};
vector<pair<int, int>> allhives;
 
void fill(){
	for(int i = 0; i < 801; i++){
		for(int j = 0; j < 801; j++){
			d[i][j] = inf;
		}
	}
}
 
bool check(int i, int j, bool which){
	if(which == 1)
		{
		if(i >= 0 && i < n && j >= 0 && j < n && (a[i][j] == 'G' || a[i][j] == 'D') && !vis[i][j]){
			return 1;
		}
		return 0;
	}
	else{
		if(i >= 0 && i < n && j >= 0 && j < n && a[i][j] == 'G' && !vis[i][j]){
			return 1;
		}
		return 0;
	}
}
 
void bfs(){
	queue<pair<int, int>> q;
	for(auto x : allhives){
		q.push(x);
		d[x.first][x.second] = 0;
	}
 
	while(!q.empty()){
		pair<int, int> u = q.front(); q.pop();
 
		for(int i1 = 0; i1 < 4; i1++){
			int x = movex[i1], y = movey[i1];
			if(check(u.first + x, u.second + y, 0)){
				if(d[u.first + x][u.second + y] != inf)continue;
				d[u.first + x][u.second + y] = d[u.first][u.second] + 1;
				q.push({u.first + x, u.second + y});
				mx = max(mx, d[u.first + x][u.second + y]);
			}
		}
	}
}
 
bool possible(int x){
	int cur = x + 1;
	memset(vis, 0, sizeof vis);
	queue<pair<pair<int, int>, pair<int,int>>> q;
 
	q.push({{st.first, st.second}, {cur, s}});
	vis[st.first][st.second] = 1;
 
	while(!q.empty()){
		auto k = q.front(); q.pop();
		int u = k.first.first, v = k.first.second, chargesleft = k.second.second;
		int now = k.second.first;
 
		for(int i = 0; i < 4; i++){
			if(check(u + movex[i], v + movey[i], 1)){
				if(d[u + movex[i]][v + movey[i]] >= now){
					if(chargesleft > 1){
						q.push({{u + movex[i], v + movey[i]}, {now, chargesleft - 1}});
					}else{
						q.push({{u + movex[i], v + movey[i]}, {now + 1, s}});
					}
					vis[u + movex[i]][v + movey[i]] = 1;
				}
			}
		}
	}
	/*cout << "x : " << x << '\n';
	for(int i = 0; i < n; i++){
		for(int j = 0; j < n; j++){
			cout << vis[i][j];
		}
		cout << '\n';
	}*/
	if(vis[en.first][en.second])return 1;
	return 0;
}
int main(){
	cin >> n >> s;
	fill();
 
	for(int i = 0; i < n; i++){
		cin >> a[i];
	}
	for(int i = 0; i < n; i++){
		for(int j = 0; j < n; j++){
			if(a[i][j] == 'H'){
				allhives.push_back({i, j});
			}
			if(a[i][j] == 'M'){
				st.first = i;
				st.second = j;
			}
			if(a[i][j] == 'D'){
				en.first = i;
				en.second = j;
			}
		}
	}
	/*for(int i = 0; i < n; i++){
		for(int j = 0; j < n; j++){
			if(d[i][j] != inf)cout << d[i][j];
			else cout << 0;
		}
		cout << '\n';
	}*/
	bfs();
	int l = 0, r = mx;
	int ans = -1;
	while(l <= r){
		int mid = l + (r - l + 1) / 2;
		if(possible(mid)){
			l = mid + 1;
			ans = mid;
		}else{
			r = mid - 1;
		}
	}
	cout << ans << '\n';
}
# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 3576 KB Output isn't correct
2 Incorrect 5 ms 3448 KB Output isn't correct
3 Incorrect 5 ms 3448 KB Output isn't correct
4 Incorrect 5 ms 3704 KB Output isn't correct
5 Correct 5 ms 3452 KB Output is correct
6 Correct 5 ms 3496 KB Output is correct
7 Correct 178 ms 4472 KB Output is correct
8 Incorrect 5 ms 3448 KB Output isn't correct
9 Correct 16 ms 3476 KB Output is correct
10 Correct 5 ms 3576 KB Output is correct
11 Correct 5 ms 3448 KB Output is correct
12 Correct 5 ms 3576 KB Output is correct
13 Incorrect 5 ms 3564 KB Output isn't correct
14 Correct 5 ms 3448 KB Output is correct
15 Incorrect 5 ms 3576 KB Output isn't correct
16 Correct 5 ms 3448 KB Output is correct
17 Incorrect 5 ms 3448 KB Output isn't correct
18 Correct 5 ms 3576 KB Output is correct
19 Incorrect 6 ms 3576 KB Output isn't correct
20 Correct 5 ms 3548 KB Output is correct
21 Incorrect 6 ms 3548 KB Output isn't correct
22 Correct 5 ms 3576 KB Output is correct
23 Incorrect 5 ms 3448 KB Output isn't correct
24 Correct 6 ms 3576 KB Output is correct
25 Incorrect 5 ms 3576 KB Output isn't correct
26 Correct 6 ms 3576 KB Output is correct
27 Incorrect 6 ms 3448 KB Output isn't correct
28 Correct 6 ms 3576 KB Output is correct
29 Incorrect 6 ms 3576 KB Output isn't correct
30 Correct 6 ms 3576 KB Output is correct
31 Incorrect 6 ms 3576 KB Output isn't correct
32 Correct 6 ms 3576 KB Output is correct
33 Incorrect 16 ms 3616 KB Output isn't correct
34 Correct 17 ms 3696 KB Output is correct
35 Correct 40 ms 3704 KB Output is correct
36 Incorrect 19 ms 3704 KB Output isn't correct
37 Correct 20 ms 3704 KB Output is correct
38 Correct 59 ms 3704 KB Output is correct
39 Incorrect 22 ms 3708 KB Output isn't correct
40 Correct 24 ms 3704 KB Output is correct
41 Correct 64 ms 3784 KB Output is correct
42 Incorrect 27 ms 3960 KB Output isn't correct
43 Correct 29 ms 3960 KB Output is correct
44 Correct 82 ms 3960 KB Output is correct
45 Incorrect 31 ms 4060 KB Output isn't correct
46 Correct 34 ms 3956 KB Output is correct
47 Correct 111 ms 4064 KB Output is correct
48 Incorrect 36 ms 4088 KB Output isn't correct
49 Correct 39 ms 4088 KB Output is correct
50 Correct 132 ms 4060 KB Output is correct
51 Incorrect 53 ms 4216 KB Output isn't correct
52 Correct 48 ms 4344 KB Output is correct
53 Correct 178 ms 4088 KB Output is correct
54 Incorrect 46 ms 4216 KB Output isn't correct
55 Correct 50 ms 4188 KB Output is correct
56 Correct 182 ms 4268 KB Output is correct
57 Incorrect 52 ms 4252 KB Output isn't correct
58 Correct 58 ms 4160 KB Output is correct
59 Correct 210 ms 4344 KB Output is correct
60 Incorrect 59 ms 4344 KB Output isn't correct
61 Correct 64 ms 4216 KB Output is correct
62 Correct 256 ms 4332 KB Output is correct
63 Correct 190 ms 4344 KB Output is correct
64 Correct 274 ms 4324 KB Output is correct
65 Correct 273 ms 4344 KB Output is correct
66 Incorrect 220 ms 4336 KB Output isn't correct
67 Correct 267 ms 4324 KB Output is correct
68 Correct 103 ms 4344 KB Output is correct
69 Correct 90 ms 4344 KB Output is correct
70 Correct 79 ms 4344 KB Output is correct
71 Correct 79 ms 4344 KB Output is correct
72 Incorrect 72 ms 4344 KB Output isn't correct
73 Incorrect 136 ms 4480 KB Output isn't correct
74 Correct 118 ms 4608 KB Output is correct
75 Correct 133 ms 4516 KB Output is correct
76 Correct 129 ms 4608 KB Output is correct
77 Correct 123 ms 4452 KB Output is correct
78 Correct 152 ms 4492 KB Output is correct
79 Correct 127 ms 4464 KB Output is correct
80 Correct 136 ms 4592 KB Output is correct
81 Correct 160 ms 4364 KB Output is correct
82 Correct 137 ms 4364 KB Output is correct
83 Correct 159 ms 4404 KB Output is correct
84 Correct 146 ms 4488 KB Output is correct
85 Correct 138 ms 4404 KB Output is correct
86 Correct 151 ms 4404 KB Output is correct
87 Correct 149 ms 4532 KB Output is correct
88 Correct 159 ms 4572 KB Output is correct
89 Correct 151 ms 4496 KB Output is correct
90 Correct 168 ms 4444 KB Output is correct
91 Correct 165 ms 4508 KB Output is correct
92 Correct 166 ms 4396 KB Output is correct