#include <bits/stdc++.h> using namespace std; #define int long long int x,y,a[100005],n,q,fsum[100005]; signed main(){ cin>>n>>q; for(int i=1;i<=n;i++){ cin>>x>>a[i]; fsum[i]=fsum[i-1]+a[i]; } while(q--){ cin>>x>>y; cout<<fsum[y]-fsum[x-1]; } return 0; } //6-9代码