3 biggest elements

    const V = [...Array(10)].map(x => Math.round(Math.random() * 100));

    const max3 = function (arr) {
      // 3 passaggi
      let [a, b, c] = [Number.MIN_SAFE_INTEGER, Number.MIN_SAFE_INTEGER - 1, Number.MIN_SAFE_INTEGER - 2];

      // N executions
      for (let i = 0; i < arr.length; i++) {
        // 1 o 2
        if (arr[i] > a) {
          a = arr[i];
        }
      }

      // N executions
      for (let i = 0; i < arr.length; i++) {
        // 1 o 2
        if (arr[i] > b && arr[i] != a) {
          b = arr[i];
        }
      }

      // N executions
      for (let i = 0; i < arr.length; i++) {
        // 1 o 2
        if (arr[i] > c && arr[i] != a && arr[i] != b) {
          c = arr[i];
        }
      }

      return [a, b, c];
    }

    // T(N) = 3N + 3 a 6N + 3 in generale impiega T(N) = KN + K'
    // S(N) = 3 = K

    // Costo lineare = T(N) = N
    // Costo spaziale = S(N) = 1