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Submission #153026

# Submission time Handle Problem Language Result Execution time Memory
153026 2019-09-11T13:54:42 Z tselmegkh Mecho (IOI09_mecho) C++14
24 / 100
 1000 ms 7032 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 + 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'){
				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;
	int ans = -1;
	while(l <= r){
		int mid = (l + r + 1) / 2;
		if(possible(mid)){
			l = mid + 1;
			ans = mid;
		}else{
			r = mid - 1;
		}
	}
	cout << ans << '\n';
}

Subtask #1
24.0 / 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 8 ms 6008 KB Output isn't correct
4 Incorrect 8 ms 6008 KB Output isn't correct
5 Correct 7 ms 6008 KB Output is correct
6 Correct 8 ms 6008 KB Output is correct
7 Execution timed out 1066 ms 6828 KB Time limit exceeded
8 Incorrect 8 ms 6008 KB Output isn't correct
9 Correct 8 ms 6008 KB Output is correct
10 Correct 8 ms 6084 KB Output is correct
11 Correct 9 ms 6072 KB Output is correct
12 Correct 7 ms 6008 KB Output is correct
13 Incorrect 40 ms 6012 KB Output isn't correct
14 Correct 40 ms 5980 KB Output is correct
15 Incorrect 7 ms 6012 KB Output isn't correct
16 Correct 7 ms 6008 KB Output is correct
17 Incorrect 7 ms 6008 KB Output isn't correct
18 Correct 7 ms 6008 KB Output is correct
19 Incorrect 7 ms 6008 KB Output isn't correct
20 Correct 7 ms 6008 KB Output is correct
21 Incorrect 7 ms 6048 KB Output isn't correct
22 Correct 8 ms 6008 KB Output is correct
23 Incorrect 7 ms 6008 KB Output isn't correct
24 Correct 8 ms 5984 KB Output is correct
25 Incorrect 7 ms 6008 KB Output isn't correct
26 Correct 8 ms 6012 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 6008 KB Output isn't correct
30 Correct 8 ms 6136 KB Output is correct
31 Incorrect 8 ms 6008 KB Output isn't correct
32 Correct 8 ms 6008 KB Output is correct
33 Incorrect 18 ms 6136 KB Output isn't correct
34 Correct 24 ms 6136 KB Output is correct
35 Correct 47 ms 6136 KB Output is correct
36 Incorrect 22 ms 6400 KB Output isn't correct
37 Correct 26 ms 6264 KB Output is correct
38 Correct 59 ms 6264 KB Output is correct
39 Incorrect 25 ms 6264 KB Output isn't correct
40 Correct 30 ms 6264 KB Output is correct
41 Correct 88 ms 6300 KB Output is correct
42 Incorrect 29 ms 6520 KB Output isn't correct
43 Correct 39 ms 6520 KB Output is correct
44 Correct 124 ms 6520 KB Output is correct
45 Incorrect 35 ms 6520 KB Output isn't correct
46 Correct 42 ms 6520 KB Output is correct
47 Correct 113 ms 6620 KB Output is correct
48 Incorrect 39 ms 6648 KB Output isn't correct
49 Correct 52 ms 6652 KB Output is correct
50 Correct 162 ms 6648 KB Output is correct
51 Incorrect 44 ms 6680 KB Output isn't correct
52 Correct 55 ms 6648 KB Output is correct
53 Correct 177 ms 6648 KB Output is correct
54 Incorrect 51 ms 6860 KB Output isn't correct
55 Correct 62 ms 6860 KB Output is correct
56 Correct 203 ms 6776 KB Output is correct
57 Incorrect 56 ms 6776 KB Output isn't correct
58 Correct 70 ms 6776 KB Output is correct
59 Correct 257 ms 6936 KB Output is correct
60 Incorrect 62 ms 6904 KB Output isn't correct
61 Correct 78 ms 6776 KB Output is correct
62 Correct 267 ms 6876 KB Output is correct
63 Execution timed out 1076 ms 6776 KB Time limit exceeded
64 Execution timed out 1074 ms 6776 KB Time limit exceeded
65 Execution timed out 1063 ms 6904 KB Time limit exceeded
66 Execution timed out 1072 ms 6776 KB Time limit exceeded
67 Execution timed out 1077 ms 6904 KB Time limit exceeded
68 Execution timed out 1074 ms 6776 KB Time limit exceeded
69 Execution timed out 1069 ms 6776 KB Time limit exceeded
70 Execution timed out 1079 ms 6776 KB Time limit exceeded
71 Execution timed out 1061 ms 6904 KB Time limit exceeded
72 Execution timed out 1060 ms 6748 KB Time limit exceeded
73 Execution timed out 1076 ms 6776 KB Time limit exceeded
74 Execution timed out 1076 ms 6776 KB Time limit exceeded
75 Execution timed out 1083 ms 6776 KB Time limit exceeded
76 Execution timed out 1080 ms 6776 KB Time limit exceeded
77 Execution timed out 1054 ms 6776 KB Time limit exceeded
78 Execution timed out 1077 ms 6776 KB Time limit exceeded
79 Execution timed out 1079 ms 7032 KB Time limit exceeded
80 Execution timed out 1070 ms 6776 KB Time limit exceeded
81 Execution timed out 1076 ms 6776 KB Time limit exceeded
82 Execution timed out 1077 ms 6904 KB Time limit exceeded
83 Execution timed out 1074 ms 6908 KB Time limit exceeded
84 Execution timed out 1087 ms 6776 KB Time limit exceeded
85 Execution timed out 1083 ms 6904 KB Time limit exceeded
86 Execution timed out 1079 ms 6948 KB Time limit exceeded
87 Execution timed out 1060 ms 6904 KB Time limit exceeded
88 Execution timed out 1077 ms 6904 KB Time limit exceeded
89 Execution timed out 1078 ms 6776 KB Time limit exceeded
90 Execution timed out 1087 ms 6776 KB Time limit exceeded
91 Execution timed out 1083 ms 6776 KB Time limit exceeded
92 Execution timed out 1085 ms 6776 KB Time limit exceeded