```f[row][col] = max(f[row][col], f[r][c] + 1);``` 这一行要放```if里面力```,这个点**合法**才更新答案 @[zhangpeinan123](/user/809165)
by Super_excavator @ 2023-03-27 20:06:40
```cpp
#include<bits/stdc++.h>
using namespace std;
int n, m, g[205][205], f[205][205], ans = 1;
int dr[4] = {-1, 1, 0, 0 };
int dc[4] = { 0, 0, -1, 1 };
void dfs(int row, int col);
signed main() {
cin >> n >> m;
memset(f, -1, sizeof(f));
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= m; j++) {
cin >> g[i][j];
}
}
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= m; j++) {
dfs(i, j);
}
}
cout << ans;
}
void dfs(int row, int col) {
if (f[row][col] != -1) {
return;
}
f[row][col] = 1;
for (int i = 0; i < 4; i++) {
int r = row + dr[i], c = col + dc[i];
if (r < 1 || r > n || c < 1 || c > m) {
continue;
}
if (g[r][c] < g[row][col] && f[r][c] != 0) {
dfs(r, c);
f[row][col] = max(f[row][col], f[r][c] + 1);
}
}
ans = max(ans, f[row][col]);
}
```
by Super_excavator @ 2023-03-27 20:07:22
@[jiangshuhong](/user/590609) 感激不尽
by The_Wandering_Earth @ 2023-03-27 20:08:02
此题已解决，警钟长鸣
by The_Wandering_Earth @ 2023-03-27 20:09:20