[Swift] 백준! 2167번 - 2차원 배열의 합

https://www.acmicpc.net/problem/2167

2167번: 2차원 배열의 합

import Foundation

let l = readLine()!.split(separator: " ").map{ Int(String($0))! }
let N = l[0]
var b:[[Int]] = []
for _ in 1...N {
    b.append(readLine()!.split(separator: " ").map{ Int(String($0))! })
}
let n = Int(readLine()!)!
for _ in 1...n {
    let l = readLine()!.split(separator: " ").map{ Int(String($0))! }
    let i = l[0]
    let j = l[1]
    let x = l[2]
    let y = l[3]
    var sum = 0
    for m in i...x {
        for l in j...y {
            sum += b[m-1][l-1]
        }
    }
    print(sum)
}