1.滑雪
//https://blog.csdn.net/qq_25202231/article/details/72925477
// dp( i,j ) = Max( dp( i-1, j ), dp( i, j+1 ),dp( i+1, j ), dp( i, j-1 ) ) + 1;
#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
int map[105][105], dp[105][105];
int n, m;
int solve(int x, int y)
{
if (dp[x][y])
return dp[x][y];
int MAX = 1;
int cur_height = map[x][y];
if (x + 1 <= n&&cur_height > map[x + 1][y])
{
int tmp = solve(x + 1, y) + 1;
MAX = max(MAX, tmp);
}
if (x - 1 > 0&&cur_height > map[x - 1][y])
{
int tmp = solve(x - 1, y) + 1;
MAX = max(MAX, tmp);
}
if (y + 1 <= m&&cur_height > map[x][y + 1])
{
int tmp = solve(x, y + 1) + 1;
MAX = max(MAX, tmp);
}
if (y - 1 > 0&&cur_height > map[x][y - 1])
{
int tmp = solve(x, y - 1) + 1;
MAX = max(MAX, tmp);
}
dp[x][y] = MAX;
return MAX;
}
int main()
{
//fstream cin("test.txt");
cin >> n >> m;
for (int i = 1; i <= n; i++)
for (int j = 1; j <= m; j++)
cin >> map[i][j];
for (int i = 1; i <= n; i++)
for (int j = 1; j <= m; j++)
solve(i, j);
int ans = 1;
for (int i = 1; i <= n; i++)
for (int j = 1; j <= m; j++)
ans = max(ans, dp[i][j]);
cout << ans << endl;
//system("pause");
return 0;
}