如何找出去编程中的对角线差异？

My code:

package main

import "fmt"

func main() {
    var n int
    fmt.Scan(&n)
    s := make([][]int, n)
    for i := 0; i < n; i++ {
        for j := 0; j < n; j++ {
            fmt.Scanf("%d %d", &s[i][j])
        }
    }
    s1 := 0
    s2 := 0
    for i := 0; i < n; i++ {
        for j := 0; j < n; j++ {
            if i == j {
                s1 += s[i][j]
            }
            if i+j == n-1 {
                s2 += s[i][j]
            }
        }
        fmt.Println(s1 - s2)
    }
}

Output:

panic: runtime error: index out of range

I tried but get panic. I want to know proper solution to this problem.

This line:

s := make([][]int, n)

Creates a slice of slices, a slice whose elements are of type []int. It creates a slice with n elements, but the elements of the outer slice are initialized with the zero value of the element type, and zero value of type []int is nil (just like for any slice type).

You get index out of range panic because any element of the outer slice s has zero length (because they are not initialized to a non-nil slice), so s[i][j] panics for any j value.

If you want to assign elements to the "inner" slices, you also have to initialize them:

for i := 0; i < n; i++ {
    s[i] = make([]int, n) // YOU ARE MISSING THIS LINE
    for j := 0; j < n; j++ {
        fmt.Scanf("%d %d", &s[i][j])
    }
}