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#include <fstream>
using namespace std;
ifstream f ("sequencequery.in");
ofstream g ("sequencequery.out");
int n,m,i,j,x,y,poz1,poz2,p,scMax,sc,a[100000];
int main()
{
f>>n>>m;
for(i=1; i<=n; i++)
f>>a[i];
for(i=1; i<=m; i++)
{
f>>x>>y;
scMax=-1500000;
sc=0;
poz1=poz2=p=x;
for(j=x; j<=y; j++)
{
sc+=a[j];
if(sc<=a[j])
{
sc=a[j];
}
if(sc>scMax)
{
scMax=sc;
}
}
g<<scMax<<'\n';
}
return 0;
}