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Submission #153019

# Submission time Handle Problem Language Result Execution time Memory
153019 2019-09-11T13:33:14 Z tselmegkh Mecho (IOI09_mecho) C++14
11 / 100
 1000 ms 7544 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 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){
	if(i >= 0 && i < n && j >= 0 && j < n && (a[i][j] == 'G' || a[i][j] == 'D') && !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(!vis[u.first + x][u.second + y] && check(u.first + x, u.second + y)){
				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});
			}
		}
	}
}

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])){
				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 = inf;

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

Subtask #1
11.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 8 ms 6008 KB Output isn't correct
2 Incorrect 8 ms 6008 KB Output isn't correct
3 Incorrect 8 ms 6008 KB Output isn't correct
4 Incorrect 8 ms 6008 KB Output isn't correct
5 Correct 8 ms 6008 KB Output is correct
6 Incorrect 9 ms 6008 KB Output isn't correct
7 Execution timed out 1067 ms 7444 KB Time limit exceeded
8 Incorrect 10 ms 6008 KB Output isn't correct
9 Correct 9 ms 6008 KB Output is correct
10 Correct 10 ms 6004 KB Output is correct
11 Correct 10 ms 6140 KB Output is correct
12 Incorrect 9 ms 6044 KB Output isn't correct
13 Incorrect 42 ms 6008 KB Output isn't correct
14 Incorrect 40 ms 6008 KB Output isn't correct
15 Incorrect 8 ms 6008 KB Output isn't correct
16 Correct 9 ms 6008 KB Output is correct
17 Incorrect 8 ms 5980 KB Output isn't correct
18 Correct 8 ms 6008 KB Output is correct
19 Incorrect 8 ms 6008 KB Output isn't correct
20 Correct 8 ms 6008 KB Output is correct
21 Incorrect 8 ms 6008 KB Output isn't correct
22 Correct 8 ms 6008 KB Output is correct
23 Incorrect 8 ms 6008 KB Output isn't correct
24 Correct 9 ms 6008 KB Output is correct
25 Incorrect 10 ms 6008 KB Output isn't correct
26 Correct 10 ms 6008 KB Output is correct
27 Incorrect 10 ms 6136 KB Output isn't correct
28 Correct 10 ms 6136 KB Output is correct
29 Incorrect 10 ms 6136 KB Output isn't correct
30 Correct 10 ms 6136 KB Output is correct
31 Incorrect 9 ms 6136 KB Output isn't correct
32 Correct 9 ms 6136 KB Output is correct
33 Incorrect 19 ms 6392 KB Output isn't correct
34 Correct 22 ms 6264 KB Output is correct
35 Correct 50 ms 6392 KB Output is correct
36 Incorrect 22 ms 6392 KB Output isn't correct
37 Correct 28 ms 6392 KB Output is correct
38 Correct 58 ms 6392 KB Output is correct
39 Incorrect 26 ms 6480 KB Output isn't correct
40 Correct 31 ms 6392 KB Output is correct
41 Correct 86 ms 6508 KB Output is correct
42 Incorrect 28 ms 6776 KB Output isn't correct
43 Correct 35 ms 6844 KB Output is correct
44 Correct 110 ms 6948 KB Output is correct
45 Incorrect 33 ms 6780 KB Output isn't correct
46 Correct 39 ms 6780 KB Output is correct
47 Correct 137 ms 6904 KB Output is correct
48 Incorrect 38 ms 6908 KB Output isn't correct
49 Correct 46 ms 6904 KB Output is correct
50 Correct 151 ms 7032 KB Output is correct
51 Incorrect 43 ms 7036 KB Output isn't correct
52 Correct 69 ms 7016 KB Output is correct
53 Correct 168 ms 7032 KB Output is correct
54 Incorrect 51 ms 7288 KB Output isn't correct
55 Correct 63 ms 7236 KB Output is correct
56 Correct 197 ms 7376 KB Output is correct
57 Incorrect 52 ms 7288 KB Output isn't correct
58 Correct 63 ms 7300 KB Output is correct
59 Correct 231 ms 7360 KB Output is correct
60 Incorrect 59 ms 7544 KB Output isn't correct
61 Correct 72 ms 7412 KB Output is correct
62 Correct 286 ms 7500 KB Output is correct
63 Execution timed out 1058 ms 7544 KB Time limit exceeded
64 Execution timed out 1088 ms 7416 KB Time limit exceeded
65 Execution timed out 1087 ms 7416 KB Time limit exceeded
66 Execution timed out 1084 ms 7416 KB Time limit exceeded
67 Execution timed out 1090 ms 7416 KB Time limit exceeded
68 Execution timed out 1055 ms 7416 KB Time limit exceeded
69 Execution timed out 1063 ms 7420 KB Time limit exceeded
70 Execution timed out 1071 ms 7416 KB Time limit exceeded
71 Execution timed out 1075 ms 7416 KB Time limit exceeded
72 Execution timed out 1065 ms 7544 KB Time limit exceeded
73 Execution timed out 1071 ms 7416 KB Time limit exceeded
74 Execution timed out 1063 ms 7416 KB Time limit exceeded
75 Execution timed out 1082 ms 7416 KB Time limit exceeded
76 Execution timed out 1068 ms 7416 KB Time limit exceeded
77 Execution timed out 1063 ms 7416 KB Time limit exceeded
78 Execution timed out 1046 ms 7372 KB Time limit exceeded
79 Execution timed out 1064 ms 7416 KB Time limit exceeded
80 Execution timed out 1066 ms 7436 KB Time limit exceeded
81 Execution timed out 1082 ms 7416 KB Time limit exceeded
82 Execution timed out 1087 ms 7416 KB Time limit exceeded
83 Execution timed out 1074 ms 7416 KB Time limit exceeded
84 Execution timed out 1071 ms 7480 KB Time limit exceeded
85 Execution timed out 1078 ms 7416 KB Time limit exceeded
86 Execution timed out 1065 ms 7416 KB Time limit exceeded
87 Execution timed out 1078 ms 7416 KB Time limit exceeded
88 Execution timed out 1071 ms 7416 KB Time limit exceeded
89 Execution timed out 1087 ms 7544 KB Time limit exceeded
90 Execution timed out 1075 ms 7416 KB Time limit exceeded
91 Execution timed out 1070 ms 7416 KB Time limit exceeded
92 Execution timed out 1067 ms 7416 KB Time limit exceeded