Merge pull request youngyangyang04#1975 from lynndove/master

增加了0056.合并区间的解法二

problems/0056.合并区间.md

@@ -177,6 +177,34 @@ func max(a, b int) int {
     return b
 }
 ```
+```go
+// 版本2
+func merge(intervals [][]int) [][]int {
+    if len(intervals) == 1 {
+        return intervals
+    }
+    sort.Slice(intervals, func(i, j int) bool {
+        return intervals[i][0] < intervals[j][0]
+    })
+    res := make([][]int, 0)
+    res = append(res, intervals[0])
+    for i := 1; i < len(intervals); i++ {
+        if intervals[i][0] <= res[len(res)-1][1]{
+            res[len(res)-1][1] = max56(res[len(res)-1][1],intervals[i][1])
+        } else {
+            res = append(res, intervals[i])
+        }
+    }
+    return res
+}
+func max56(a, b int) int {
+    if a > b {
+        return a
+    }
+    return b
+}
+```
+
 
 ### Javascript 
 ```javascript