dp

tanfanhua · tanfanhua · commit bc0cd6eb0635 · 2022-11-02T11:29:34.000+08:00
diff --git a/src/com/blankj/medium/_0062/Solution.java b/src/com/blankj/medium/_0062/Solution.java
@@ -0,0 +1,30 @@
+package com.blankj.medium._062;
+
+public class Solution {
+
+    public static void main(String[] args) {
+        Solution s = new Solution();
+        System.out.println(s.uniquePath(3, 2));
+        System.out.println(s.uniquePath(7, 3));
+    }
+
+    public int uniquePath(int m, int n) {
+        if (m <= 0 || n <= 0) {
+            return -1;
+        }
+
+        int[][] f = new int[m][n];
+        for (int i = 0; i < m; i++) {
+            f[i][0] = 1;
+        }
+        for (int j = 0; j < n; j++) {
+            f[0][j] = 1;
+        }
+        for (int i = 1; i < m; i++) {
+            for (int j = 1; j < n; j++) {
+                f[i][j] = f[i][j - 1] + f[i - 1][j];
+            }
+        }
+        return f[m - 1][n - 1];
+    }
+}
