Programación Competitiva

#include <bits/stdc++.h>
#define INF 0x3F3F3F3F
using namespace std;

int main() {
        long long int n,l; cin>>n>>l;
        long long int arr[n+1]; arr[0]=0;
        for(int i =1 ; i<=n;i++) if(i==0) cin>>arr[i]; else {cin>>arr[i]; arr[i]+=arr[i-1];}
        for(int i=0; i<l;i++)
        {
            long long int nu,l=0,h=n; cin>>nu;
            while (l <= h)
               {
                   int m = l + (h-l)/2;
                   if (arr[m-1]<nu&&nu<=arr[m]) {cout<<m<<" "<<nu-arr[m-1]<<endl; break;}
                   if (arr[m] < nu) l = m + 1;
                   else h = m - 1;
               }
        }
    return 0;
}