//https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8 より
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};
    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };
    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };
    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };
    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };
    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}

//

use std::io::Write;

fn run() {
    let out = std::io::stdout();
    let mut out = std::io::BufWriter::new(out.lock());
    input! {
        n: usize,
        q: usize,
        a: [i64; 2 * n],
        b: [i64; 2 * n],
        p: [(usize1, i64, i64); q],
    }
    let mut a = a;
    let mut b = b;
    assert!(q <= 10);
    for (p, x, y) in p {
        a[p] = x;
        b[p] = y;
        let mut c = vec![];
        for i in 1..(2 * n - 1) {
            c.push(b[i] - a[i]);
        }
        c.sort();
        let mut sum = a.iter().fold(0, |s, a| s + *a);
        let mut ans = sum;
        for (i, c) in c.iter().rev().enumerate() {
            sum += c;
            if i % 2 == 1 {
                ans = std::cmp::max(ans, sum);
            }
        }
        writeln!(out, "{}", ans).ok();
    }
}

fn main() {
    run();
}
