#include<bits/stdc++.h>
using namespace std;
//#pragma GCC optimize("Ofast")
//#pragma GCC target("avx,avx2,fma")
//#pragma GCC optimization ("unroll-loops")
#define rep(i, x, y) for(int i = x; i <= y; ++i)
#define repi(i,x,y) for(int i = x; i >= y; --i)
#define ci(x) int x; cin>> x
#define TC(t) ci(t); while(t--)
#define fi first
#define se second
#define pb push_back
#define all(x) x.begin(), x.end()
#define cii(x, y) ci(x); ci(y)
#define ciii(x, y, z) ci(x); ci(y); ci(z)
#define mp make_pair
//#define int long long
typedef long long ll;
typedef vector<int> vi;
const int N = 4e3 + 5;
const int mod = 1e9 + 7;
const int mod1 = 1e9 + 9;
const int pi = 31;
const int inf = 1e9 + 5;
const int block = 330;
const int dx[4] = {0, 0, 1, -1};
const int dy[4] = {1, -1, 0, 0};
void readfile(){
#ifdef ONLINE_JUDGE
#else
freopen("text.inp", "r", stdin);
#endif // ONLINE_JUDGE
// freopen("248.in", "r", stdin);
// freopen("248.out", "w", stdout);
}
int n, m;
char a[N][N];
void inp(){
cin >> n >> m;
rep(i,1,n)
rep(j,1,m)
cin >> a[i][j];
}
queue<pair<int,int> > q[2];
int d[N][N], vis[N][N];
void bfs(int x, int y){
rep(i,1,n)
rep(j,1,m)
d[i][j] = inf;
d[x][y] = 0;
q[0].push(mp(x, y));
int num = 1, pos = 0;
while(num){
while(q[pos % 2].empty())
++pos;
auto top = q[pos % 2].front();
q[pos % 2].pop(), --num;
if(vis[top.fi][top.se]) continue;
vis[top.fi][top.se] = 1;
rep(i,0,3){
int x = top.fi + dx[i];
int y = top.se + dy[i];
if(1 <= x && x <= n && 1 <= y && y <= m && a[x][y]!='.'){
int cost = (a[x][y] != a[top.fi][top.se]);
if(d[x][y] > d[top.fi][top.se] + cost){
d[x][y] = d[top.fi][top.se] + cost;
q[d[x][y] % 2].push(mp(x, y));
++num;
}
}
}
}
}
void process(){
bfs(1,1);
int res = 0;
rep(i,1,n)
rep(j,1,m)
if(d[i][j]!=inf)
res = max(res, d[i][j]);
cout << res;
}
int main() {
// readfile();
ios_base::sync_with_stdio(0);
cin.tie(0);
// TC(t){
inp();
process();
// }
return 0;
}
Compilation message
tracks.cpp: In function 'void readfile()':
tracks.cpp:33:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
33 | freopen("text.inp", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
27 ms |
8456 KB |
Output isn't correct |
| 2 |
Incorrect |
1 ms |
460 KB |
Output isn't correct |
| 3 |
Incorrect |
1 ms |
844 KB |
Output isn't correct |
| 4 |
Incorrect |
13 ms |
7632 KB |
Output isn't correct |
| 5 |
Incorrect |
8 ms |
4428 KB |
Output isn't correct |
| 6 |
Incorrect |
1 ms |
536 KB |
Output isn't correct |
| 7 |
Incorrect |
1 ms |
844 KB |
Output isn't correct |
| 8 |
Incorrect |
1 ms |
972 KB |
Output isn't correct |
| 9 |
Incorrect |
2 ms |
1484 KB |
Output isn't correct |
| 10 |
Incorrect |
5 ms |
3660 KB |
Output isn't correct |
| 11 |
Incorrect |
4 ms |
3088 KB |
Output isn't correct |
| 12 |
Incorrect |
7 ms |
4560 KB |
Output isn't correct |
| 13 |
Incorrect |
4 ms |
4420 KB |
Output isn't correct |
| 14 |
Incorrect |
5 ms |
4436 KB |
Output isn't correct |
| 15 |
Incorrect |
20 ms |
8144 KB |
Output isn't correct |
| 16 |
Incorrect |
21 ms |
8292 KB |
Output isn't correct |
| 17 |
Incorrect |
19 ms |
7988 KB |
Output isn't correct |
| 18 |
Incorrect |
12 ms |
7708 KB |
Output isn't correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
23 ms |
46412 KB |
Output isn't correct |
| 2 |
Incorrect |
80 ms |
24952 KB |
Output isn't correct |
| 3 |
Incorrect |
404 ms |
120772 KB |
Output isn't correct |
| 4 |
Incorrect |
139 ms |
51448 KB |
Output isn't correct |
| 5 |
Incorrect |
292 ms |
91760 KB |
Output isn't correct |
| 6 |
Incorrect |
1694 ms |
151748 KB |
Output isn't correct |
| 7 |
Incorrect |
21 ms |
48460 KB |
Output isn't correct |
| 8 |
Incorrect |
27 ms |
46420 KB |
Output isn't correct |
| 9 |
Incorrect |
3 ms |
892 KB |
Output isn't correct |
| 10 |
Incorrect |
1 ms |
452 KB |
Output isn't correct |
| 11 |
Incorrect |
22 ms |
47556 KB |
Output isn't correct |
| 12 |
Incorrect |
2 ms |
2232 KB |
Output isn't correct |
| 13 |
Incorrect |
103 ms |
24848 KB |
Output isn't correct |
| 14 |
Incorrect |
45 ms |
16856 KB |
Output isn't correct |
| 15 |
Incorrect |
48 ms |
20192 KB |
Output isn't correct |
| 16 |
Incorrect |
33 ms |
9280 KB |
Output isn't correct |
| 17 |
Incorrect |
249 ms |
48980 KB |
Output isn't correct |
| 18 |
Incorrect |
172 ms |
55624 KB |
Output isn't correct |
| 19 |
Incorrect |
139 ms |
51452 KB |
Output isn't correct |
| 20 |
Incorrect |
96 ms |
42800 KB |
Output isn't correct |
| 21 |
Incorrect |
247 ms |
92460 KB |
Output isn't correct |
| 22 |
Incorrect |
273 ms |
91724 KB |
Output isn't correct |
| 23 |
Incorrect |
404 ms |
75584 KB |
Output isn't correct |
| 24 |
Incorrect |
244 ms |
89168 KB |
Output isn't correct |
| 25 |
Incorrect |
749 ms |
141480 KB |
Output isn't correct |
| 26 |
Incorrect |
983 ms |
123976 KB |
Output isn't correct |
| 27 |
Incorrect |
1481 ms |
143216 KB |
Output isn't correct |
| 28 |
Incorrect |
1699 ms |
151676 KB |
Output isn't correct |
| 29 |
Incorrect |
1623 ms |
150112 KB |
Output isn't correct |
| 30 |
Incorrect |
1450 ms |
146508 KB |
Output isn't correct |
| 31 |
Incorrect |
1068 ms |
113728 KB |
Output isn't correct |
| 32 |
Incorrect |
1259 ms |
142240 KB |
Output isn't correct |
