update 0056.合并区间: 替换 go 代码和markdown语法错误

problems/0056.合并区间.md

@@ -207,24 +207,26 @@ class Solution:
 ```
 
 ### Go 
-```golang
+```go
 func merge(intervals [][]int) [][]int {
-    //先从小到大排序
-    sort.Slice(intervals,func(i,j int)bool{
-        return intervals[i][0]<intervals[j][0]
+    sort.Slice(intervals, func(i, j int) bool {
+        return intervals[i][0] < intervals[j][0]
     })
-    //再弄重复的
-    for i:=0;i<len(intervals)-1;i++{
-        if intervals[i][1]>=intervals[i+1][0]{
-            intervals[i][1]=max(intervals[i][1],intervals[i+1][1])//赋值最大值
-            intervals=append(intervals[:i+1],intervals[i+2:]...)
-            i--
+    res := make([][]int, 0, len(intervals))
+    left, right := intervals[0][0], intervals[0][1]
+    for i := 1; i < len(intervals); i++ {
+        if right < intervals[i][0] {
+            res = append(res, []int{left, right})
+            left, right = intervals[i][0], intervals[i][1]
+        } else {
+            right = max(right, intervals[i][1])
         }
     }
-    return intervals
+    res = append(res, []int{left, right})  // 将最后一个区间放入
+    return res
 }
-func max(a,b int)int{
-    if a>b{
+func max(a, b int) int {
+    if a > b {
         return a
     }
     return b