oj.uz

Submission #674633

# Submission time Handle Problem Language Result Execution time Memory
674633 2022-12-25T14:23:52 Z sudheerays123 Mecho (IOI09_mecho) C++17
100 / 100
 271 ms 11312 KB 
#include<bits/stdc++.h>
using namespace std;
#define fast ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define ll long long int
const ll N = 800+5 , INF = 1e18 , MOD = 1e9+7;

ll sx,sy,ex,ey;
vector<ll> dx = {0,0,-1,1};
vector<ll> dy = {-1,1,0,0};
vector<vector<ll>> bee(N,vector<ll>(N,INF));
vector<vector<char>> grid(N,vector<char>(N));
ll n,s;

bool check(ll start){

	vector<vector<ll>> dist(n+5,vector<ll>(n+5,INF));
	dist[sx][sy] = start;

	queue<pair<ll,ll>> q;
	q.push(make_pair(sx,sy));

	while(!q.empty()){
		ll a = q.front().first;
		ll b = q.front().second;
		q.pop();

		for(ll t = 0; t <= 3; t++){
			ll x = a+dx[t];
			ll y = b+dy[t];

			if(x < 1 || x > n || y < 1 || y > n || grid[x][y] == 'T') continue;
			if(dist[x][y] != INF) continue;

			ll d = dist[a][b]+1;

			if(bee[x][y] < ((d-start)%s == 0)+start+ceil(double(d-start)/(double)s)) continue;
			
			dist[x][y] = d;
			q.push(make_pair(x,y));
		}
	}

	return (dist[ex][ey] != INF);
}

void solve(){

	cin >> n >> s;

	queue<pair<ll,ll>> q;

	for(ll i = 1; i <= n; i++){
		for(ll j = 1; j <= n; j++){
			cin >> grid[i][j];

			if(grid[i][j] == 'M'){
				sx = i;
				sy = j;
			}
			else if(grid[i][j] == 'H'){
				q.push(make_pair(i,j));
				bee[i][j] = 0;
			}
			else if(grid[i][j] == 'D'){
				ex = i;
				ey = j;
			}
		}
	}

	while(!q.empty()){
		ll a = q.front().first;
		ll b = q.front().second;
		q.pop();

		for(ll t = 0; t <= 3; t++){
			ll x = a+dx[t];
			ll y = b+dy[t];

			if(x < 1 || x > n || y < 1 || y > n || grid[x][y] == 'D' || grid[x][y] == 'T') continue;
			if(bee[x][y] != INF) continue;
			
			bee[x][y] = bee[a][b]+1;
			q.push(make_pair(x,y));
		}
	}

	ll low = 0 , high = bee[sx][sy]-1;
	ll ans = INF;

	while(low <= high){
		ll mid = (low+high)/2;

		if(check(mid)){
			ans = mid;
			low = mid+1;
		}
		else high = mid-1;
	}

	if(ans == INF) ans = -1;
	cout << ans;
}

int main(){

	fast;

	ll tc = 1;
	// cin >> tc;
	while(tc--) solve();

	return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 5972 KB Output is correct
2 Correct 3 ms 5972 KB Output is correct
3 Correct 4 ms 5972 KB Output is correct
4 Correct 4 ms 5972 KB Output is correct
5 Correct 5 ms 5972 KB Output is correct
6 Correct 3 ms 5972 KB Output is correct
7 Correct 137 ms 11212 KB Output is correct
8 Correct 4 ms 5972 KB Output is correct
9 Correct 4 ms 5972 KB Output is correct
10 Correct 4 ms 5972 KB Output is correct
11 Correct 4 ms 5972 KB Output is correct
12 Correct 3 ms 6100 KB Output is correct
13 Correct 3 ms 6100 KB Output is correct
14 Correct 4 ms 6100 KB Output is correct
15 Correct 3 ms 5972 KB Output is correct
16 Correct 3 ms 5972 KB Output is correct
17 Correct 3 ms 5972 KB Output is correct
18 Correct 3 ms 5972 KB Output is correct
19 Correct 3 ms 5972 KB Output is correct
20 Correct 4 ms 5972 KB Output is correct
21 Correct 4 ms 6100 KB Output is correct
22 Correct 3 ms 6100 KB Output is correct
23 Correct 4 ms 6100 KB Output is correct
24 Correct 4 ms 6100 KB Output is correct
25 Correct 3 ms 6100 KB Output is correct
26 Correct 4 ms 6100 KB Output is correct
27 Correct 4 ms 6100 KB Output is correct
28 Correct 4 ms 6100 KB Output is correct
29 Correct 5 ms 6100 KB Output is correct
30 Correct 4 ms 6100 KB Output is correct
31 Correct 4 ms 6100 KB Output is correct
32 Correct 3 ms 6100 KB Output is correct
33 Correct 12 ms 7080 KB Output is correct
34 Correct 12 ms 7132 KB Output is correct
35 Correct 29 ms 7064 KB Output is correct
36 Correct 14 ms 7428 KB Output is correct
37 Correct 15 ms 7384 KB Output is correct
38 Correct 39 ms 7408 KB Output is correct
39 Correct 19 ms 7760 KB Output is correct
40 Correct 19 ms 7708 KB Output is correct
41 Correct 74 ms 7732 KB Output is correct
42 Correct 26 ms 8136 KB Output is correct
43 Correct 23 ms 8160 KB Output is correct
44 Correct 59 ms 8088 KB Output is correct
45 Correct 27 ms 8544 KB Output is correct
46 Correct 30 ms 8580 KB Output is correct
47 Correct 82 ms 8424 KB Output is correct
48 Correct 31 ms 9008 KB Output is correct
49 Correct 31 ms 9008 KB Output is correct
50 Correct 84 ms 8976 KB Output is correct
51 Correct 42 ms 9508 KB Output is correct
52 Correct 52 ms 9548 KB Output is correct
53 Correct 111 ms 9492 KB Output is correct
54 Correct 41 ms 10100 KB Output is correct
55 Correct 44 ms 10104 KB Output is correct
56 Correct 131 ms 10000 KB Output is correct
57 Correct 47 ms 10604 KB Output is correct
58 Correct 53 ms 10636 KB Output is correct
59 Correct 156 ms 10716 KB Output is correct
60 Correct 58 ms 11244 KB Output is correct
61 Correct 59 ms 11312 KB Output is correct
62 Correct 188 ms 11296 KB Output is correct
63 Correct 150 ms 11188 KB Output is correct
64 Correct 271 ms 11232 KB Output is correct
65 Correct 220 ms 11200 KB Output is correct
66 Correct 176 ms 11188 KB Output is correct
67 Correct 162 ms 11236 KB Output is correct
68 Correct 78 ms 11228 KB Output is correct
69 Correct 63 ms 11224 KB Output is correct
70 Correct 60 ms 11244 KB Output is correct
71 Correct 55 ms 11204 KB Output is correct
72 Correct 55 ms 11240 KB Output is correct
73 Correct 50 ms 11212 KB Output is correct
74 Correct 110 ms 11216 KB Output is correct
75 Correct 94 ms 11248 KB Output is correct
76 Correct 89 ms 11264 KB Output is correct
77 Correct 97 ms 11228 KB Output is correct
78 Correct 99 ms 11232 KB Output is correct
79 Correct 92 ms 11212 KB Output is correct
80 Correct 100 ms 11216 KB Output is correct
81 Correct 92 ms 11220 KB Output is correct
82 Correct 94 ms 11228 KB Output is correct
83 Correct 121 ms 11228 KB Output is correct
84 Correct 113 ms 11232 KB Output is correct
85 Correct 124 ms 11272 KB Output is correct
86 Correct 122 ms 11220 KB Output is correct
87 Correct 118 ms 11212 KB Output is correct
88 Correct 127 ms 11204 KB Output is correct
89 Correct 123 ms 11220 KB Output is correct
90 Correct 146 ms 11228 KB Output is correct
91 Correct 143 ms 11208 KB Output is correct
92 Correct 133 ms 11232 KB Output is correct