// PARK CHAEYOUNG IS MY LOVE
// Author: Ngo Ba Van
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define fi first
#define se second
using ii=pair<int,int>;
const ll N=4e3+5,M=1e9+7;
ll n,m,res,dis[N][N],sz[N][N];
ll dx[4]={-1,0,1,0},dy[4]={0,1,0,-1};
char a[N][N];
bool check(int x,int y)
{
return (x>0&&y>0&&x<=n&&y<=m&&a[x][y]!='.');
}
void BFS()
{
deque<ii>de;
//memset(dis,0x3f,sizeof dis);
dis[1][1]=1;
de.push_back({1,1});
while (!de.empty())
{
int u=de.front().fi;
int v=de.front().se;
res=max(res,dis[u][v]);
de.pop_front();
for (int i=0;i<=3;i++)
{
int uv=u+dx[i];
int vv=v+dy[i];
if (check(uv,vv)==true&&dis[uv][vv]==0)
{
if (a[uv][vv]==a[u][v])
{
dis[uv][vv]=dis[u][v];
de.push_front({uv,vv});
}
else
{
dis[uv][vv]=dis[u][v]+1;
de.push_back({uv,vv});
}
}
}
}
}
void nhap()
{
cin>>n>>m;
for (int i=1;i<=n;i++)
{
string s;
cin>>s;
for (int j=1;j<=m;j++)
a[i][j]=s[j-1];
}
BFS();
cout<<res;
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
#define task ""
#define task "a"
if(fopen(task".inp","r"))
{
freopen(task".inp","r",stdin);
freopen(task".out","w",stdout);
}
int t=1;
//cin>>t;
while (t--)
nhap();
}
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Compilation message
tracks.cpp:66: warning: "task" redefined
66 | #define task "a"
|
tracks.cpp:65: note: this is the location of the previous definition
65 | #define task ""
|
tracks.cpp: In function 'int main()':
tracks.cpp:69:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
69 | freopen(task".inp","r",stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
tracks.cpp:70:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
70 | freopen(task".out","w",stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
11 ms |
6356 KB |
Output is correct |
| 2 |
Correct |
1 ms |
464 KB |
Output is correct |
| 3 |
Correct |
1 ms |
724 KB |
Output is correct |
| 4 |
Correct |
7 ms |
5720 KB |
Output is correct |
| 5 |
Correct |
3 ms |
3160 KB |
Output is correct |
| 6 |
Correct |
1 ms |
468 KB |
Output is correct |
| 7 |
Correct |
1 ms |
724 KB |
Output is correct |
| 8 |
Correct |
1 ms |
852 KB |
Output is correct |
| 9 |
Correct |
1 ms |
1108 KB |
Output is correct |
| 10 |
Correct |
3 ms |
2644 KB |
Output is correct |
| 11 |
Correct |
3 ms |
2268 KB |
Output is correct |
| 12 |
Correct |
5 ms |
3416 KB |
Output is correct |
| 13 |
Correct |
3 ms |
3160 KB |
Output is correct |
| 14 |
Correct |
3 ms |
3208 KB |
Output is correct |
| 15 |
Correct |
10 ms |
6108 KB |
Output is correct |
| 16 |
Correct |
11 ms |
6336 KB |
Output is correct |
| 17 |
Correct |
9 ms |
6140 KB |
Output is correct |
| 18 |
Correct |
7 ms |
5844 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
15 ms |
31096 KB |
Output is correct |
| 2 |
Correct |
42 ms |
18264 KB |
Output is correct |
| 3 |
Correct |
186 ms |
91224 KB |
Output is correct |
| 4 |
Correct |
74 ms |
46460 KB |
Output is correct |
| 5 |
Correct |
178 ms |
71200 KB |
Output is correct |
| 6 |
Correct |
545 ms |
171632 KB |
Output is correct |
| 7 |
Correct |
21 ms |
32496 KB |
Output is correct |
| 8 |
Correct |
17 ms |
31064 KB |
Output is correct |
| 9 |
Correct |
3 ms |
852 KB |
Output is correct |
| 10 |
Correct |
1 ms |
596 KB |
Output is correct |
| 11 |
Correct |
18 ms |
31780 KB |
Output is correct |
| 12 |
Correct |
2 ms |
1620 KB |
Output is correct |
| 13 |
Correct |
40 ms |
18380 KB |
Output is correct |
| 14 |
Correct |
23 ms |
12504 KB |
Output is correct |
| 15 |
Correct |
21 ms |
17060 KB |
Output is correct |
| 16 |
Correct |
18 ms |
7212 KB |
Output is correct |
| 17 |
Correct |
95 ms |
36300 KB |
Output is correct |
| 18 |
Correct |
81 ms |
51404 KB |
Output is correct |
| 19 |
Correct |
69 ms |
46484 KB |
Output is correct |
| 20 |
Correct |
48 ms |
30408 KB |
Output is correct |
| 21 |
Correct |
115 ms |
63168 KB |
Output is correct |
| 22 |
Correct |
148 ms |
71192 KB |
Output is correct |
| 23 |
Correct |
202 ms |
57596 KB |
Output is correct |
| 24 |
Correct |
121 ms |
61724 KB |
Output is correct |
| 25 |
Correct |
496 ms |
156932 KB |
Output is correct |
| 26 |
Correct |
319 ms |
185948 KB |
Output is correct |
| 27 |
Correct |
451 ms |
186460 KB |
Output is correct |
| 28 |
Correct |
570 ms |
171748 KB |
Output is correct |
| 29 |
Correct |
535 ms |
167700 KB |
Output is correct |
| 30 |
Correct |
520 ms |
173908 KB |
Output is correct |
| 31 |
Correct |
430 ms |
116220 KB |
Output is correct |
| 32 |
Correct |
400 ms |
175484 KB |
Output is correct |
