#include<bits/stdc++.h>
using namespace std;
#include<atcoder/segtree.hpp>
#include<atcoder/modint.hpp>
using mint=atcoder::static_modint<998244353>;

using T=tuple<int,int,mint,mint>;
T f(T s,T t){
    if(get<1>(s)==-1)return t;
    if(get<1>(t)==-1)return s;
    if(get<1>(s)<get<0>(t)){
        return make_tuple(get<0>(s),get<1>(t),get<2>(s)*get<2>(t),get<3>(s)+get<3>(t)*get<2>(s));
    }else{
        return make_tuple(get<0>(t)>0?~get<0>(t):get<0>(t),get<1>(t),get<2>(t),get<3>(t));
    }
}
T id(){
    return make_tuple(-1,-1,mint(1),mint(0));
}

int main(){
    int n,q;
    cin>>n>>q;
    vector<int>a(n);
    vector<T>v(n);
    for(int i=0;i<n;++i){
        cin>>a[i];
        v[i]=make_tuple(a[i],a[i],mint(2),mint(a[i]));
    }
    atcoder::segtree<T,f,id>seg(v);
    while(q--){
        int l,r;
        cin>>l>>r;
        l--;
        auto [x,y,z,w]=seg.prod(l,r);
        if(x<0)x=~x;
        cout<<((w+x)/2).val()<<endl;
    }
}