// your code goes here
 
function prefixSumArr(arr, n) {
	let prefixSumArr = new Array(n);
	prefixSumArr[0] = arr[0];
	for(let i=1;i<n;i++) {
		prefixSumArr[i] = arr[i] + prefixSumArr[i-1];
	}
	return prefixSumArr;
}
 
// console.log(prefixSumArr([10, 20, 10, 5, 15], 5))
 
 
function suffixSumArr(arr, n) {
	let suffixSumArr = new Array(n);
	suffixSumArr[n-1] = arr[n-1];
	for(let i=n-2;i>=0;i--) {
		suffixSumArr[i] = arr[i] + suffixSumArr[i+1];
	}
	return suffixSumArr;
}
console.log(suffixSumArr([10, 20, 10, 5, 15], 5))

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