{
  "title": "Missing Number",
  "category": "Introductory Problems",
  "slug": "missing-number",
  "officialUrl": "https://cses.fi/problemset/task/1083",
  "level": "basic",
  "tags": ["math", "sum"],
  "status": "solved",
  "order": 2,
  "summary": "One value from 1 through n is absent from the input list; recover it without sorting."
}