Submission #484836

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
484836	2021-11-05T15:18:31 Z	PoPularPlusPlus	Mecho (IOI09_mecho)	C++17	84 / 100	207 ms	9380 KB

mecho

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long 
#define pb(e) push_back(e)
#define sv(a) sort(a.begin(),a.end())
#define sa(a,n) sort(a,a+n)
#define mp(a,b) make_pair(a,b)
#define vf first
#define vs second
#define ar array
#define all(x) x.begin(),x.end()
const int inf = 0x3f3f3f3f;
const int mod = 1000000007; 
const double PI=3.14159265358979323846264338327950288419716939937510582097494459230;
bool remender(ll a , ll b){return a%b;}

void clear( std::queue<pair<int,int>> &q )
{
   std::queue<pair<int,int>> empty;
   std::swap( q, empty );
}

void solve(){
	int dx[4] = {0,0,-1,1} , dy[4] = {1,-1,0,0};
	int n , s;
	cin >> n >> s;
	char arr[n][n];
	for(int i = 0; i < n; i++){
		for(int j = 0; j < n; j++)cin >> arr[i][j];
	}
	queue<pair<int,int>> q;
	ll dis[n][n];
	for(int i = 0; i < n; i++){
		for(int j = 0; j < n; j++)dis[i][j] = 1e18;
	}
	bool vis[n][n];
	memset(vis,0,sizeof vis);
	pair<int,int> end, start;
	for(int i = 0; i < n; i++){
		for(int j = 0; j < n; j++){
			if(arr[i][j] == 'H'){q.push(mp(i,j));dis[i][j] = 0;vis[i][j] = 1;}
			if(arr[i][j] == 'D')end = mp(i,j);
			if(arr[i][j] == 'M')start = mp(i,j);
		}
	}
	while(q.size()){
		pair<int,int> node = q.front();
		q.pop();
		for(int i = 0; i < 4; i++){
			if(node.vf + dx[i] >= 0 && node.vf + dx[i] < n && node.vs + dy[i] < n && node.vs + dy[i] >= 0 && !vis[node.vf + dx[i]][node.vs + dy[i]] && arr[node.vf + dx[i]][node.vs + dy[i]] == 'G'){
				q.push(mp(node.vf + dx[i] , node.vs + dy[i]));
				dis[node.vf + dx[i]][node.vs + dy[i]] = dis[node.vf][node.vs] + 1;
				vis[node.vf + dx[i]][node.vs + dy[i]] = 1;
			}
		}
	}
	int dis1[n][n];
	int l = 0 , r = n * n + 3;
	if(dis[start.vf][start.vs] != 1e18)r = dis[start.vf][start.vs]-1;
	int ans = -1;
	while(l <= r){
		int mid = (l + r)/2;
		dis1[start.vf][start.vs] = s * mid;
		memset(vis,0,sizeof vis);
		vis[start.vf][start.vs] = 1;
		clear(q);
		q.push(mp(start.vf , start.vs));
		while(q.size() && !vis[end.vf][end.vs]){
			pair<int,int> node = q.front();
			q.pop();
			for(int i = 0; i < 4; i++){
				if(node.vf + dx[i] >= 0 && node.vf + dx[i] < n && node.vs + dy[i] < n && node.vs + dy[i] >= 0 && !vis[node.vf + dx[i]][node.vs + dy[i]] && (arr[node.vf + dx[i]][node.vs + dy[i]] == 'G' || arr[node.vf + dx[i]][node.vs + dy[i]] == 'D') && dis[node.vf + dx[i]][node.vs + dy[i]] > (dis1[node.vf][node.vs] + 1)/s){
					q.push(mp(node.vf + dx[i] , node.vs + dy[i]));
					dis1[node.vf + dx[i]][node.vs + dy[i]] = dis1[node.vf][node.vs] + 1;
					vis[node.vf + dx[i]][node.vs + dy[i]] = 1;
				}
			}
		}
		if(vis[end.vf][end.vs]){
			ans = mid;
			l = mid + 1;
		}
		else r = mid - 1;
	}
	cout << ans << '\n';
}

int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
	//int t;cin >> t;while(t--)
	solve();
	return 0;
}

Subtask #1

84.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	204 KB	Output is correct
2	Correct	0 ms	204 KB	Output is correct
3	Correct	0 ms	204 KB	Output is correct
4	Correct	0 ms	204 KB	Output is correct
5	Correct	0 ms	204 KB	Output is correct
6	Correct	1 ms	204 KB	Output is correct
7	Correct	84 ms	9156 KB	Output is correct
8	Correct	0 ms	204 KB	Output is correct
9	Correct	0 ms	204 KB	Output is correct
10	Correct	0 ms	204 KB	Output is correct
11	Correct	0 ms	204 KB	Output is correct
12	Incorrect	1 ms	332 KB	Output isn't correct
13	Incorrect	0 ms	332 KB	Output isn't correct
14	Correct	1 ms	332 KB	Output is correct
15	Correct	0 ms	204 KB	Output is correct
16	Correct	0 ms	204 KB	Output is correct
17	Correct	1 ms	204 KB	Output is correct
18	Correct	0 ms	204 KB	Output is correct
19	Correct	0 ms	204 KB	Output is correct
20	Correct	0 ms	204 KB	Output is correct
21	Correct	0 ms	204 KB	Output is correct
22	Correct	0 ms	204 KB	Output is correct
23	Correct	0 ms	332 KB	Output is correct
24	Correct	0 ms	332 KB	Output is correct
25	Correct	1 ms	332 KB	Output is correct
26	Correct	0 ms	332 KB	Output is correct
27	Correct	0 ms	332 KB	Output is correct
28	Correct	0 ms	332 KB	Output is correct
29	Correct	0 ms	332 KB	Output is correct
30	Correct	0 ms	332 KB	Output is correct
31	Correct	1 ms	332 KB	Output is correct
32	Correct	1 ms	332 KB	Output is correct
33	Correct	4 ms	1868 KB	Output is correct
34	Correct	4 ms	1868 KB	Output is correct
35	Correct	21 ms	1868 KB	Output is correct
36	Correct	5 ms	2380 KB	Output is correct
37	Correct	6 ms	2380 KB	Output is correct
38	Correct	27 ms	2380 KB	Output is correct
39	Correct	6 ms	3020 KB	Output is correct
40	Correct	6 ms	3020 KB	Output is correct
41	Correct	35 ms	3060 KB	Output is correct
42	Correct	8 ms	3660 KB	Output is correct
43	Correct	8 ms	3660 KB	Output is correct
44	Correct	45 ms	3660 KB	Output is correct
45	Correct	9 ms	4428 KB	Output is correct
46	Correct	9 ms	4424 KB	Output is correct
47	Correct	50 ms	4428 KB	Output is correct
48	Correct	11 ms	5240 KB	Output is correct
49	Correct	11 ms	5232 KB	Output is correct
50	Correct	62 ms	5196 KB	Output is correct
51	Correct	15 ms	5976 KB	Output is correct
52	Correct	16 ms	6040 KB	Output is correct
53	Correct	90 ms	6092 KB	Output is correct
54	Correct	14 ms	6988 KB	Output is correct
55	Correct	15 ms	6900 KB	Output is correct
56	Correct	90 ms	7008 KB	Output is correct
57	Correct	17 ms	7876 KB	Output is correct
58	Correct	18 ms	7992 KB	Output is correct
59	Correct	105 ms	7988 KB	Output is correct
60	Correct	19 ms	9036 KB	Output is correct
61	Correct	25 ms	8996 KB	Output is correct
62	Correct	131 ms	9068 KB	Output is correct
63	Correct	107 ms	9036 KB	Output is correct
64	Correct	207 ms	9056 KB	Output is correct
65	Correct	154 ms	9060 KB	Output is correct
66	Correct	137 ms	9060 KB	Output is correct
67	Correct	118 ms	9004 KB	Output is correct
68	Correct	50 ms	9028 KB	Output is correct
69	Correct	51 ms	9028 KB	Output is correct
70	Correct	38 ms	8984 KB	Output is correct
71	Correct	45 ms	9028 KB	Output is correct
72	Incorrect	35 ms	9024 KB	Output isn't correct
73	Incorrect	76 ms	9380 KB	Output isn't correct
74	Correct	59 ms	9344 KB	Output is correct
75	Correct	74 ms	9332 KB	Output is correct
76	Correct	63 ms	9248 KB	Output is correct
77	Correct	63 ms	9280 KB	Output is correct
78	Correct	75 ms	9252 KB	Output is correct
79	Correct	50 ms	9284 KB	Output is correct
80	Correct	63 ms	9200 KB	Output is correct
81	Correct	67 ms	9284 KB	Output is correct
82	Correct	61 ms	9312 KB	Output is correct
83	Correct	78 ms	9256 KB	Output is correct
84	Correct	70 ms	9196 KB	Output is correct
85	Correct	75 ms	9272 KB	Output is correct
86	Correct	76 ms	9272 KB	Output is correct
87	Correct	81 ms	9284 KB	Output is correct
88	Correct	78 ms	9216 KB	Output is correct
89	Correct	80 ms	9152 KB	Output is correct
90	Correct	81 ms	9168 KB	Output is correct
91	Correct	80 ms	9216 KB	Output is correct
92	Correct	88 ms	9168 KB	Output is correct