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806. Number of Lines To Write String 👎

  • Time: $O(n)$
  • Space: $O(1)$
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class Solution {
 public:
  vector<int> numberOfLines(vector<int>& widths, string s) {
    int numLines = 1;
    int runningWidth = 0;

    for (const char c : s) {
      const int width = widths[c - 'a'];
      if (runningWidth + width <= 100) {
        runningWidth += width;
      } else {
        ++numLines;
        runningWidth = width;
      }
    }

    return {numLines, runningWidth};
  }
};

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class Solution {
  public int[] numberOfLines(int[] widths, String s) {
    int numLines = 1;
    int runningWidth = 0;

    for (final char c : s.toCharArray()) {
      final int width = widths[c - 'a'];
      if (runningWidth + width <= 100) {
        runningWidth += width;
      } else {
        ++numLines;
        runningWidth = width;
      }
    }

    return new int[] {numLines, runningWidth};
  }
}

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class Solution:
  def numberOfLines(self, widths: List[int], s: str) -> List[int]:
    numLines = 1
    runningWidth = 0

    for c in s:
      width = widths[ord(c) - ord('a')]
      if runningWidth + width <= 100:
        runningWidth += width
      else:
        numLines += 1
        runningWidth = width

    return [numLines, runningWidth]