```go
package main
import (
"fmt"
"time"
)
func main() {
size := 20000
matrix1 := make([][]int, size)
for i := 0; i < size; i++ {
matrix1[i] = make([]int, size)
}
start1 := time.Now()
// 方法1
for i := 0; i < size; i++ {
for j := 0; j < size; j++ {
matrix1[i][j] = i + j
}
}
fmt.Println(time.Since(start1))
matrix2 := make([][]int, size)
for i := 0; i < size; i++ {
matrix2[i] = make([]int, size)
}
// 方法2
start2 := time.Now()
for i := 0; i < size; i++ {
for j := 0; j < size; j++ {
matrix2[j][i] = i + j
}
}
fmt.Println(time.Since(start2))
}
// 1.1769527s
// 8.5584257s
```
为啥第1一种更快呢？
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