'commit'

TangDou/LanQiaoBei/LanQiao14STEMA202210/TangDou_5.cpp

@@ -0,0 +1,42 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+const int N = 110;
+const int INF = 0x3f3f3f3f;
+int n, m;
+int a[N][N];
+int dx[] = {-1, 0, 1, 0}; //上右下左
+int dy[] = {0, 1, 0, -1}; //上右下左
+int res;
+/*
+3 3
+3 2 1
+3 4 5
+2 1 3
+
+答案：
+4
+*/
+void dfs(int x, int y, int last, int cnt) {
+    res = max(res, cnt);
+
+    for (int i = 0; i < 4; i++) {
+        int tx = dx[i] + x, ty = dy[i] + y;
+        if (tx <= 0 || tx > n || ty <= 0 || ty > m) continue;
+        if (a[tx][ty] < last)
+            dfs(tx, ty, a[x][y], cnt + 1);
+    }
+}
+int main() {
+    cin >> n >> m;
+    for (int i = 1; i <= n; i++)
+        for (int j = 1; j <= m; j++)
+            cin >> a[i][j];
+
+    for (int i = 1; i <= n; i++)
+        for (int j = 1; j <= m; j++)
+            dfs(i, j, INF, 0);
+
+    printf("%d\n", res - 1);
+    return 0;
+}