@@ -1140,6 +1140,10 @@ func (this *NumArray) SumRange(i int, j int) int {
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11411141### 解法一:二维前缀和
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1143+ <!-- tabs:start -->
1144+ 1145+ #### ** Python**
1146+ 11431147``` python
11441148class NumMatrix :
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@@ -1162,6 +1166,48 @@ class NumMatrix:
11621166# param_1 = obj.sumRegion(row1,col1,row2,col2)
11631167```
11641168
1169+ #### ** Go**
1170+ 1171+ ``` go
1172+ type NumMatrix struct {
1173+ sums [][]int
1174+ }
1175+ 1176+ 1177+ func Constructor (matrix [][]int ) NumMatrix {
1178+ m := len (matrix)
1179+ if m == 0 {
1180+ return NumMatrix{}
1181+ }
1182+ n := len (matrix[0 ])
1183+ sums := make ([][]int , m + 1 )
1184+ // 初始化第 0 行
1185+ sums[0 ] = make ([]int , n + 1 )
1186+ for i , row := range matrix {
1187+ sums[i + 1 ] = make ([]int , n + 1 )
1188+ for j , num := range row {
1189+ sums[i + 1 ][j + 1 ] = sums[i][j + 1 ] + sums[i + 1 ][j] - sums[i][j] + num
1190+ }
1191+ }
1192+ 1193+ return NumMatrix{sums}
1194+ }
1195+ 1196+ 1197+ func (this *NumMatrix ) SumRegion (row1 int , col1 int , row2 int , col2 int ) int {
1198+ return this.sums [row2 + 1 ][col2 + 1 ] - this.sums [row2 + 1 ][col1] - this.sums [row1][col2 + 1 ] + this.sums [row1][col1]
1199+ }
1200+ 1201+ 1202+ /* *
1203+ * Your NumMatrix object will be instantiated and called as such:
1204+ * obj := Constructor(matrix);
1205+ * param_1 := obj.SumRegion(row1,col1,row2,col2);
1206+ */
1207+ ```
1208+ 1209+ <!-- tabs:end -->
1210+ 11651211## 309. 最佳买卖股票时机含冷冻期
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11671213[ 原题链接] ( https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock-with-cooldown/ )
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