class Solution {
    public int sumOddLengthSubarrays(int[] arr) {
        int res=0;
        for(int i=0;i<arr.length;i++){
            int size=0,sum=0;
            for(int j=i;j<arr.length;j++){
                size++;sum+=arr[j];
                if(size%2==1)res+=sum;
            }
        }
        return res;
    }
}