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Submission #153023

# Submission time Handle Problem Language Result Execution time Memory
153023 2019-09-11T13:48:02 Z tselmegkh Mecho (IOI09_mecho) C++14
20 / 100
 1000 ms 6928 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;

	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 6012 KB Output isn't correct
2 Incorrect 7 ms 6008 KB Output isn't correct
3 Incorrect 7 ms 6008 KB Output isn't correct
4 Incorrect 7 ms 6048 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 1052 ms 6788 KB Time limit exceeded
8 Incorrect 9 ms 6008 KB Output isn't correct
9 Correct 8 ms 6008 KB Output is correct
10 Correct 9 ms 6008 KB Output is correct
11 Correct 8 ms 6008 KB Output is correct
12 Correct 8 ms 6008 KB Output is correct
13 Incorrect 42 ms 6008 KB Output isn't correct
14 Incorrect 40 ms 6080 KB Output isn't correct
15 Incorrect 9 ms 6008 KB Output isn't correct
16 Correct 9 ms 6008 KB Output is correct
17 Incorrect 9 ms 6008 KB Output isn't correct
18 Correct 8 ms 6008 KB Output is correct
19 Incorrect 7 ms 6008 KB Output isn't correct
20 Correct 7 ms 5880 KB Output is correct
21 Incorrect 8 ms 6008 KB Output isn't correct
22 Correct 8 ms 6028 KB Output is correct
23 Incorrect 7 ms 6008 KB Output isn't correct
24 Correct 7 ms 6012 KB Output is correct
25 Incorrect 8 ms 6008 KB Output isn't correct
26 Correct 8 ms 5980 KB Output is correct
27 Incorrect 9 ms 6076 KB Output isn't correct
28 Correct 8 ms 6008 KB Output is correct
29 Incorrect 7 ms 6008 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 8 ms 6008 KB Output is correct
33 Incorrect 18 ms 6136 KB Output isn't correct
34 Correct 21 ms 6252 KB Output is correct
35 Correct 46 ms 6136 KB Output is correct
36 Incorrect 21 ms 6264 KB Output isn't correct
37 Correct 25 ms 6244 KB Output is correct
38 Correct 60 ms 6264 KB Output is correct
39 Incorrect 25 ms 6184 KB Output isn't correct
40 Correct 31 ms 6264 KB Output is correct
41 Correct 77 ms 6264 KB Output is correct
42 Incorrect 29 ms 6520 KB Output isn't correct
43 Correct 37 ms 6520 KB Output is correct
44 Correct 99 ms 6520 KB Output is correct
45 Incorrect 34 ms 6648 KB Output isn't correct
46 Correct 42 ms 6520 KB Output is correct
47 Correct 122 ms 6520 KB Output is correct
48 Incorrect 38 ms 6648 KB Output isn't correct
49 Correct 48 ms 6648 KB Output is correct
50 Correct 150 ms 6776 KB Output is correct
51 Incorrect 44 ms 6648 KB Output isn't correct
52 Correct 54 ms 6648 KB Output is correct
53 Correct 175 ms 6708 KB Output is correct
54 Incorrect 50 ms 6776 KB Output isn't correct
55 Correct 62 ms 6748 KB Output is correct
56 Correct 207 ms 6756 KB Output is correct
57 Incorrect 55 ms 6776 KB Output isn't correct
58 Correct 70 ms 6928 KB Output is correct
59 Correct 238 ms 6748 KB Output is correct
60 Incorrect 62 ms 6776 KB Output isn't correct
61 Correct 79 ms 6876 KB Output is correct
62 Correct 265 ms 6776 KB Output is correct
63 Execution timed out 1070 ms 6904 KB Time limit exceeded
64 Execution timed out 1090 ms 6776 KB Time limit exceeded
65 Execution timed out 1084 ms 6776 KB Time limit exceeded
66 Execution timed out 1062 ms 6780 KB Time limit exceeded
67 Execution timed out 1069 ms 6776 KB Time limit exceeded
68 Execution timed out 1051 ms 6776 KB Time limit exceeded
69 Execution timed out 1045 ms 6908 KB Time limit exceeded
70 Execution timed out 1087 ms 6776 KB Time limit exceeded
71 Execution timed out 1079 ms 6804 KB Time limit exceeded
72 Execution timed out 1058 ms 6776 KB Time limit exceeded
73 Execution timed out 1086 ms 6776 KB Time limit exceeded
74 Execution timed out 1068 ms 6776 KB Time limit exceeded
75 Execution timed out 1077 ms 6776 KB Time limit exceeded
76 Execution timed out 1039 ms 6792 KB Time limit exceeded
77 Execution timed out 1076 ms 6904 KB Time limit exceeded
78 Execution timed out 1081 ms 6780 KB Time limit exceeded
79 Execution timed out 1078 ms 6776 KB Time limit exceeded
80 Execution timed out 1085 ms 6776 KB Time limit exceeded
81 Execution timed out 1084 ms 6776 KB Time limit exceeded
82 Execution timed out 1079 ms 6776 KB Time limit exceeded
83 Execution timed out 1060 ms 6776 KB Time limit exceeded
84 Execution timed out 1074 ms 6776 KB Time limit exceeded
85 Execution timed out 1058 ms 6868 KB Time limit exceeded
86 Execution timed out 1063 ms 6788 KB Time limit exceeded
87 Execution timed out 1076 ms 6776 KB Time limit exceeded
88 Execution timed out 1065 ms 6904 KB Time limit exceeded
89 Execution timed out 1081 ms 6736 KB Time limit exceeded
90 Execution timed out 1066 ms 6776 KB Time limit exceeded
91 Execution timed out 1068 ms 6904 KB Time limit exceeded
92 Execution timed out 1073 ms 6776 KB Time limit exceeded