题目描述 小姜有 � n 个数字，现在小姜想知道，从l到r这个区间内所有的数字和是多少 输出格式 � m 行，每行一个整数C++

Sure! Here's an example code in C++ that solves the problem:

#include <iostream>
#include <vector>

using namespace std;

int main() {
    int n, m;
    cin >> n >> m;

    vector<int> nums(n);
    for (int i = 0; i < n; i++) {
        cin >> nums[i];
    }

    for (int i = 0; i < m; i++) {
        int l, r;
        cin >> l >> r;

        int sum = 0;
        for (int j = l - 1; j < r; j++) { // assuming 1-based indexing
            sum += nums[j];
        }

        cout << sum << endl;
    }

    return 0;
}

This code takes input for the number of elements `n`, the number of queries `m`, and the `n` numbers. It then calculates the sum of the numbers in each query range `l` to `r` and prints the result.

Please note that this is a basic implementation and may not handle edge cases or optimize for performance.