package easy;

public class e303 {

    private int[] sums;

    public e303(int[] nums) {
        sums = new int[nums.length+1];
        for (int i = 0; i < nums.length; i++) sums[i+1] = sums[i] + nums[i];
    }
    
    public int sumRange(int i, int j) {
        return sums[j+1] - sums[i];
    }
    
    public static void main(String[] args) {
        int[] nums = {-2, 0, 3, -5, 2, -1};
        e303 obj = new e303(nums);
        int param_1 = obj.sumRange(2, 5);
        System.out.println(param_1);
    }
}