function arrayManipulation(n, queries) {
    let arr = [], max = 0, x = 0
    arr.length = n+1
    arr.fill(0)
    for (let i = 0; i < queries.length; i++) {
        const a = queries[i][0]
        const b = queries[i][1]
        const k = queries[i][2]
        arr[a] +=k
        if ((b+1)<=n) arr[b+1]-=k;
    }
    for (let i = 1; i <= n; i++ ) {
        x = x + arr[i]
        if (x > max) max = x
    }
    return max
}