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#include <iostream>
#include <fstream>
using namespace std;
int main()
{
ifstream f("sequencequery.in");
ofstream g("sequencequery.out");
int v[101],n,m, a[2][101];
f>>n>>m;
for(int i=1;i<=n;i++) f>>v[i];
for(int i=1;i<=m;i++) f>>a[0][i]>>a[1][i];
int pozi, pozj,maxsum, maxcurent, maxprev,j;
for(int i=1;i<=m;i++)
{
pozi=a[0][i];
pozj=a[1][i];
maxprev=v[pozi];maxsum=v[pozi];
for(j=pozi;j<=pozj;j++)
{
maxcurent = max(v[j], maxprev + v[j]);
if(maxcurent>maxsum) maxsum=maxcurent;
maxprev=maxcurent;
}
g<<maxsum<<endl;
}
}