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  1. #include <iostream>
  2. #include <bits/stdc++.h>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	int n,q	;
  7. 	cin>>n>>q;
  8. 	vector<long long>arr(n);
  9. 	for (int i = 0; i < n; i++) {
  10. 		cin>>arr[i];
  11. 	}
  12. 	 vector<long long> prefix(n + 1, 0);
  13.     for (int i = 0; i < n; i++) {
  14.         prefix[i + 1] = prefix[i] + arr[i];
  15.     }
  16.     for(int i=0;i<q;i++){
  17.     	int r,l;
  18.     	cin>>r>>l;
  19.     	cout<<prefix[r+1]-prefix[l]<<endl;
  20.     }
  21.  
  22. 	return 0;
  23. }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
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6 3
6 4 2 7 2 7
1 3
3 6
1 6
stdout
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-2
-9
-18
https://ideone.com/fJiN2X
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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