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#include <fstream>
using namespace std;
ifstream f("sequencequery.in");
ofstream g("sequencequery.out");
int a[100005];
int verif(int s,int d)
{
int i,sum=0,mx;
mx=-1000000000;
for(i=s;i<=d;i++)
{
sum+=a[i];
if(sum>mx)
{
mx=sum;
}
if(sum<0)
{
sum=0;
}
}
return mx;
}
int main()
{
int n,i,x,y,m;
f>>n>>m;
for(i=1;i<=n;i++)
{
f>>a[i];
}
for(i=1;i<=m;i++)
{
f>>x>>y;
g<<verif(x,y)<<'\n';
}
return 0;
}