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@ranapu
Last active March 29, 2017 16:57
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Diagonal Difference in Go
package main
import "fmt"
import "math"
func main() {
var n int
fmt.Scan(&n)
var d1, d2, e int
for i := 0; i < n; i++ {
for j := 0; j < n; j++ {
fmt.Scan(&e)
if i == j {
d1 += e
}
if j == n - i - 1 {
d2 += e
}
}
}
fmt.Print(math.Abs(float64(d1 - d2)))
}
@ranapu
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ranapu commented Mar 29, 2017

Given a square matrix of size , calculate the absolute difference between the sums of its diagonals.

Input Format

The first line contains a single integer, . The next lines denote the matrix's rows, with each line containing space-separated integers describing the columns.

Output Format

Print the absolute difference between the two sums of the matrix's diagonals as a single integer.

Sample Input

3
11 2 4
4 5 6
10 8 -12
Sample Output

15
Explanation

The primary diagonal is:
11
5
-12

Sum across the primary diagonal: 11 + 5 - 12 = 4

The secondary diagonal is:
4
5
10
Sum across the secondary diagonal: 4 + 5 + 10 = 19
Difference: |4 - 19| = 15

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