Merge pull request gzc426#782 from MMzhe/patch-63

Create sourcema.md

Author: gzc426

2019.01.30-leetcode62/sourcema.md

@@ -0,0 +1,21 @@
+# LeetCode 62
+    class Solution {
+    public int uniquePaths(int m, int n) {
+        if (m == 1 || n == 1) {
+            return 1;
+        }
+        int[][] dp = new int[m][n];
+        for (int i = 1; i < n; i++) {
+            dp[0][i]=1;
+        }
+        for (int i = 1; i < m; i++) {
+            dp[i][0]=1;
+        }
+        for (int i = 1; i < m; i++) {
+            for (int j = 1; j < n; j++) {
+                dp[i][j] = dp[i - 1][j] + dp[i][j - 1];
+            }
+        }
+        return dp[m - 1][n - 1];
+    }
+}