func arrayManipulation(n: Int, queries: [[Int]]) -> Int {

    var numbers = Array(repeating: 0, count: n + 1)
    var ans = 0

    for i in 0 ..< queries.count {
        var a = queries[i][0]
        var b1 = queries[i][1] + 1
        var k = queries[i][2]

        numbers[a] += k
        
        if b1 <= n {
            numbers[b1] -= k
        }
    }

    for i in 1...n {
        numbers[i] += numbers[i - 1]
				
        if numbers[i] > ans {
            ans = numbers[i]
        }
    }
		
    return ans
}