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Submission #153020

# Submission time Handle Problem Language Result Execution time Memory
153020 2019-09-11T13:38:31 Z tselmegkh Mecho (IOI09_mecho) C++14
20 / 100
 1000 ms 7012 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};

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(int i, int j){
	memset(vis, 0, sizeof vis);
	memset(dis, 0, sizeof dis);
	queue<pair<int, int>> q;
	dis[i][j] = 0;
	vis[i][j] = 1;
	q.push({i, j});

	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)){
				vis[u.first + x][u.second + y] = 1;
				dis[u.first + x][u.second + y] = dis[u.first][u.second] + 1;
				d[u.first + x][u.second + y] = min(d[u.first + x][u.second + y], dis[u.first + x][u.second + y]);
				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;
	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'){
				bfs(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';
	}*/

	int l = 0, r = mx;

	while(l != r){
		int mid = l + (r - l + 1) / 2;
		if(possible(mid)){
			l = mid;
		}else{
			r = mid - 1;
		}
	}
	cout << l << '\n';
}

Subtask #1
20.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 7 ms 6008 KB Output isn't correct
2 Incorrect 8 ms 6008 KB Output isn't correct
3 Incorrect 7 ms 6008 KB Output isn't correct
4 Incorrect 7 ms 6008 KB Output isn't correct
5 Correct 7 ms 6008 KB Output is correct
6 Correct 8 ms 6012 KB Output is correct
7 Execution timed out 1077 ms 6776 KB Time limit exceeded
8 Incorrect 9 ms 6008 KB Output isn't correct
9 Correct 9 ms 6008 KB Output is correct
10 Correct 9 ms 6012 KB Output is correct
11 Correct 9 ms 6184 KB Output is correct
12 Correct 8 ms 6012 KB Output is correct
13 Incorrect 41 ms 6008 KB Output isn't correct
14 Incorrect 41 ms 6008 KB Output isn't correct
15 Incorrect 7 ms 6008 KB Output isn't correct
16 Correct 7 ms 6008 KB Output is correct
17 Incorrect 7 ms 6012 KB Output isn't correct
18 Correct 9 ms 6008 KB Output is correct
19 Incorrect 7 ms 6008 KB Output isn't correct
20 Correct 8 ms 6008 KB Output is correct
21 Incorrect 5 ms 6008 KB Output isn't correct
22 Correct 8 ms 6012 KB Output is correct
23 Incorrect 7 ms 6008 KB Output isn't correct
24 Correct 8 ms 5880 KB Output is correct
25 Incorrect 9 ms 6008 KB Output isn't correct
26 Correct 9 ms 6008 KB Output is correct
27 Incorrect 7 ms 6008 KB Output isn't correct
28 Correct 8 ms 6008 KB Output is correct
29 Incorrect 8 ms 5880 KB Output isn't correct
30 Correct 8 ms 6008 KB Output is correct
31 Incorrect 8 ms 6008 KB Output isn't correct
32 Correct 9 ms 6008 KB Output is correct
33 Incorrect 18 ms 6172 KB Output isn't correct
34 Correct 22 ms 6236 KB Output is correct
35 Correct 48 ms 6136 KB Output is correct
36 Incorrect 22 ms 6264 KB Output isn't correct
37 Correct 26 ms 6264 KB Output is correct
38 Correct 65 ms 6392 KB Output is correct
39 Incorrect 24 ms 6264 KB Output isn't correct
40 Correct 31 ms 6392 KB Output is correct
41 Correct 89 ms 6264 KB Output is correct
42 Incorrect 28 ms 6492 KB Output isn't correct
43 Correct 52 ms 6492 KB Output is correct
44 Correct 102 ms 6572 KB Output is correct
45 Incorrect 35 ms 6520 KB Output isn't correct
46 Correct 39 ms 6520 KB Output is correct
47 Correct 134 ms 6648 KB Output is correct
48 Incorrect 39 ms 6648 KB Output isn't correct
49 Correct 48 ms 6648 KB Output is correct
50 Correct 154 ms 6648 KB Output is correct
51 Incorrect 46 ms 6696 KB Output isn't correct
52 Correct 57 ms 6648 KB Output is correct
53 Correct 189 ms 6776 KB Output is correct
54 Incorrect 54 ms 6752 KB Output isn't correct
55 Correct 72 ms 6748 KB Output is correct
56 Correct 240 ms 6780 KB Output is correct
57 Incorrect 56 ms 6904 KB Output isn't correct
58 Correct 76 ms 6800 KB Output is correct
59 Correct 270 ms 6804 KB Output is correct
60 Incorrect 68 ms 6904 KB Output isn't correct
61 Correct 89 ms 6896 KB Output is correct
62 Correct 303 ms 6844 KB Output is correct
63 Execution timed out 1092 ms 6776 KB Time limit exceeded
64 Execution timed out 1036 ms 6780 KB Time limit exceeded
65 Execution timed out 1040 ms 6776 KB Time limit exceeded
66 Execution timed out 1068 ms 6776 KB Time limit exceeded
67 Execution timed out 1068 ms 6776 KB Time limit exceeded
68 Execution timed out 1081 ms 6776 KB Time limit exceeded
69 Execution timed out 1014 ms 6776 KB Time limit exceeded
70 Execution timed out 1016 ms 6776 KB Time limit exceeded
71 Execution timed out 1047 ms 6776 KB Time limit exceeded
72 Execution timed out 1071 ms 6776 KB Time limit exceeded
73 Execution timed out 1065 ms 6776 KB Time limit exceeded
74 Execution timed out 1044 ms 6776 KB Time limit exceeded
75 Execution timed out 1039 ms 6776 KB Time limit exceeded
76 Execution timed out 1012 ms 6776 KB Time limit exceeded
77 Execution timed out 1082 ms 6780 KB Time limit exceeded
78 Execution timed out 1046 ms 6904 KB Time limit exceeded
79 Execution timed out 1082 ms 6776 KB Time limit exceeded
80 Execution timed out 1042 ms 6776 KB Time limit exceeded
81 Execution timed out 1054 ms 6776 KB Time limit exceeded
82 Execution timed out 1056 ms 6904 KB Time limit exceeded
83 Execution timed out 1045 ms 6776 KB Time limit exceeded
84 Execution timed out 1063 ms 6776 KB Time limit exceeded
85 Execution timed out 1020 ms 6956 KB Time limit exceeded
86 Execution timed out 1012 ms 6904 KB Time limit exceeded
87 Execution timed out 1065 ms 6776 KB Time limit exceeded
88 Execution timed out 1055 ms 6776 KB Time limit exceeded
89 Execution timed out 1018 ms 7012 KB Time limit exceeded
90 Execution timed out 1004 ms 6776 KB Time limit exceeded
91 Execution timed out 1065 ms 6776 KB Time limit exceeded
92 Execution timed out 1010 ms 6776 KB Time limit exceeded