덧칠하기

export function overPainting(n: number, m: number, section: number[]): number {
  let totalSection = 0;
  let lastIndex = -1;
  for (const i of section) {
    if (i <= lastIndex) {
      continue;
    }
    lastIndex = i + m - 1;
    totalSection += 1;
  }
 
  return totalSection;
}