#include <bits/stdc++.h>
#define REP(i,n) for(LL i=0;i<(LL)(n);i++)
#define ALL(x) (x).begin(),(x).end()
#define LL long long
#define pii pair<LL,LL>
#define pll pair<LL,LL>

using namespace std;

struct SegmentTree{

    LL n;
    vector<LL> data;
    vector<LL> num;
    vector<LL> minusmax;
    vector<LL> plusmin;

    SegmentTree(LL _n){
        n = 2;
        while(n<_n)n*=2;
        data.resize(2*n-1, INT_MIN);
        num.resize(2*n-1, 0);
        minusmax.resize(2*n-1, INT_MIN);
        plusmin.resize(2*n-1, INT_MAX);
    }

    void set(LL pos, LL x){
        pos += n-1;
        data[pos]=x;
        if(x > 0){
            num[pos] = 1;
            plusmin[pos] = x;
            minusmax[pos] = INT_MIN;
        }else{
            num[pos]=0;
            minusmax[pos] = x;
            plusmin[pos] = INT_MAX;
        }
        while(pos > 0){
            pos = (pos-1)/2;
            data[pos] = (max(0LL, data[2*pos +1]) + max(0LL, data[2*pos +2]));
            num[pos] = num[2*pos +1] + num[2*pos + 2];
            minusmax[pos] = max(minusmax[2*pos + 1], minusmax[2*pos + 2]);
            plusmin[pos] = min(plusmin[2*pos + 1], plusmin[2*pos + 2]);
        }
    }

    LL getSum(LL l, LL r, LL a=0, LL b=-1, LL pos=0){
        if(b<0)b=n;
        if(l>=b || r <= a)return 0;
        if(l<=a && r <= b)return max(0LL,data[pos]);
        return getSum(l, r, a, (a+b)/2, pos*2+1) + getSum(l, r, (a+b)/2, b, pos*2+2);
    }
    LL getNum(LL l,LL r, LL a=0, LL b=-1, LL pos=0){
        if(b<0)b=n;
        if(l>=b || r <= a)return 0;
        if(l<=a && r <= b)return num[pos];
        return getNum(l, r, a, (a+b)/2, pos*2+1) + getNum(l, r, (a+b)/2, b, pos*2+2);
    }
    LL getMinusMax(LL l,LL r,LL a=0, LL b=-1, LL pos=0){
        if(b<0)b=n;
        if(l>=b || r <= a)return INT_MIN;
        if(l<=a && r <= b)return minusmax[pos];
        return max(getMinusMax(l, r, a, (a+b)/2, pos*2+1) ,getMinusMax(l, r, (a+b)/2, b, pos*2+2));
    }
    LL getPlusMin(LL l,LL r,LL a=0, LL b=-1, LL pos=0){
        if(b<0)b=n;
        if(l>=b || r <= a)return INT_MAX;
        if(l<=a && r <= b)return plusmin[pos];
        return min(getPlusMin(l, r, a, (a+b)/2, pos*2+1) ,getPlusMin(l, r, (a+b)/2, b, pos*2+2));
    }

    void printData(){
        cout<<endl;
        REP(i,n)cout<<n-1+i<<" "<<data[n-1+i]<<endl;
        cout<<endl;
    }
};


int main(){

    LL N,Q;cin>>N>>Q;
    LL ans=0;
    LL a[2*N], b[2*N];

    REP(i,2*N)cin>>a[i];
    REP(i,2*N)cin>>b[i];

    if(N==1){
        while(Q--){
            LL p,x,y;cin>>p>>x>>y;
            a[--p]=x;
            ans = a[0]+a[1];
            cout<<ans<<endl;
        }
    }else{
        REP(i,2*N)ans += a[i];
        SegmentTree st(2*N-2);
        REP(i,2*N-2)st.set(i, b[i+1]-a[i+1]);

        while(Q--){
            LL p,x,y;cin>>p>>x>>y;
            ans -= a[--p];
            a[p]=x;
            b[p]=y;
            ans += a[p];
            if(p != 0 && p != 2*N-1)st.set(p-1, y-x);

            LL res = ans + st.getSum(0,2*N-2);
            if(st.getNum(0,2*N-2)%2==1){
                res = max(res - st.getPlusMin(0,2*N-2), res + st.getMinusMax(0,2*N-2));
            }


            cout<<res<<endl;

        }
    }
    return 0;
}

Measured memory_bytes: 21248