Time: 1 ms (89.19%), Space: 57.6 MB (91.89%) - LeetHub

Author: furic

3707-equal-score-substrings/3707-equal-score-substrings.ts

@@ -3,11 +3,10 @@ const scoreBalance = (s: string): boolean => {
 
  // Build prefix sum array: prefixSum[i] = sum of scores from index 0 to i
  const prefixSum: number[] = new Array(stringLength);
- prefixSum[0] = s.charCodeAt(0) - 96;
 
- for (let index = 1; index < stringLength; index++) {
+ for (let index = 0; index < stringLength; index++) {
  const charScore = s.charCodeAt(index) - 96;
- prefixSum[index] = prefixSum[index - 1] + charScore;
+ prefixSum[index] = (index > 0 ? prefixSum[index - 1] : 0) + charScore;
  }
 
  const totalScore = prefixSum[stringLength - 1];