#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef pair<int,int> pii;
typedef pair<long long, long long> pll;
using namespace std;
int n, m;
vector<string> mat;
bool vis[4001][4001];
int dist[4001][4001], dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};
bool in_range(int i, int j){
if(i >= 0 && j >= 0 && i < n && j < m) return true;
return false;
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(0);
cin>>n>>m;
mat.resize(n);
for(int i = 0; i < n; i++)
cin>>mat[i];
deque<pii> q;
q.push_front(mp(0,0));
int ans = 1;
dist[0][0] = vis[0][0] = 1;
while(!q.empty()){
pii at = q.front();
q.pop_front();
ans = max(ans, dist[at.first][at.second]);
for(int dir = 0; dir < 4; dir++){
int nx = at.first + dx[dir], ny = at.second + dy[dir];
if(in_range(nx, ny) && mat[nx][ny] != '.' && !vis[nx][ny]){
vis[nx][ny] = true;
dist[nx][ny] = dist[at.first][at.second] + (mat[at.first][at.second] != mat[nx][ny]);
if(mat[at.first][at.second] != mat[nx][ny]) q.pb(mp(nx,ny));
else q.push_front(mp(nx,ny));
//q.push(mp(-dist[nx][ny], mp(nx,ny)));
}
}
}
cout<<ans<<endl;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
13 ms |
5460 KB |
Output is correct |
| 2 |
Correct |
1 ms |
468 KB |
Output is correct |
| 3 |
Correct |
1 ms |
724 KB |
Output is correct |
| 4 |
Correct |
7 ms |
5204 KB |
Output is correct |
| 5 |
Correct |
2 ms |
2900 KB |
Output is correct |
| 6 |
Correct |
1 ms |
468 KB |
Output is correct |
| 7 |
Correct |
0 ms |
724 KB |
Output is correct |
| 8 |
Correct |
1 ms |
724 KB |
Output is correct |
| 9 |
Correct |
1 ms |
1108 KB |
Output is correct |
| 10 |
Correct |
2 ms |
2524 KB |
Output is correct |
| 11 |
Correct |
3 ms |
2132 KB |
Output is correct |
| 12 |
Correct |
6 ms |
3028 KB |
Output is correct |
| 13 |
Correct |
2 ms |
2900 KB |
Output is correct |
| 14 |
Correct |
2 ms |
2900 KB |
Output is correct |
| 15 |
Correct |
8 ms |
5204 KB |
Output is correct |
| 16 |
Correct |
10 ms |
5460 KB |
Output is correct |
| 17 |
Correct |
7 ms |
5204 KB |
Output is correct |
| 18 |
Correct |
8 ms |
5232 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
15 ms |
30932 KB |
Output is correct |
| 2 |
Correct |
33 ms |
15180 KB |
Output is correct |
| 3 |
Correct |
144 ms |
75488 KB |
Output is correct |
| 4 |
Correct |
66 ms |
32924 KB |
Output is correct |
| 5 |
Correct |
87 ms |
54284 KB |
Output is correct |
| 6 |
Correct |
509 ms |
110412 KB |
Output is correct |
| 7 |
Correct |
16 ms |
32232 KB |
Output is correct |
| 8 |
Correct |
15 ms |
30860 KB |
Output is correct |
| 9 |
Correct |
2 ms |
596 KB |
Output is correct |
| 10 |
Correct |
1 ms |
340 KB |
Output is correct |
| 11 |
Correct |
16 ms |
31656 KB |
Output is correct |
| 12 |
Correct |
1 ms |
1620 KB |
Output is correct |
| 13 |
Correct |
41 ms |
15180 KB |
Output is correct |
| 14 |
Correct |
18 ms |
10500 KB |
Output is correct |
| 15 |
Correct |
17 ms |
13140 KB |
Output is correct |
| 16 |
Correct |
15 ms |
5768 KB |
Output is correct |
| 17 |
Correct |
78 ms |
29012 KB |
Output is correct |
| 18 |
Correct |
63 ms |
36072 KB |
Output is correct |
| 19 |
Correct |
55 ms |
32988 KB |
Output is correct |
| 20 |
Correct |
38 ms |
25812 KB |
Output is correct |
| 21 |
Correct |
114 ms |
53608 KB |
Output is correct |
| 22 |
Correct |
90 ms |
54328 KB |
Output is correct |
| 23 |
Correct |
152 ms |
44756 KB |
Output is correct |
| 24 |
Correct |
89 ms |
50764 KB |
Output is correct |
| 25 |
Correct |
355 ms |
96392 KB |
Output is correct |
| 26 |
Correct |
311 ms |
132488 KB |
Output is correct |
| 27 |
Correct |
427 ms |
130896 KB |
Output is correct |
| 28 |
Correct |
554 ms |
110416 KB |
Output is correct |
| 29 |
Correct |
566 ms |
107988 KB |
Output is correct |
| 30 |
Correct |
479 ms |
113664 KB |
Output is correct |
| 31 |
Correct |
371 ms |
74528 KB |
Output is correct |
| 32 |
Correct |
394 ms |
118204 KB |
Output is correct |
