2019-04: Secure Container

library(mistlecode)

dt <-
  "235741-706948" |>
  strsplit("-") |>
  unlist() |>
  as.numeric()
dt <- dt[1]:dt[2]

Part 1

s1 <- map(dt, \(password) {
  s <- str_split(password, "", simplify = TRUE)
  ret1 <- ifelse(all(s == cummax(s)), TRUE, FALSE)
  ret2 <- ifelse(!str_detect(password, "(.)\\1"), FALSE, TRUE)
  
  ret <- ifelse(ret1 & ret2, TRUE, FALSE)
  return(ret)
}) |>
  unlist()
sum(s1)

[1] 1178

dt <- dt[s1]

Part 2

s2 <-
  sapply(dt, \(s) {
    s <- str_split(s, "") |> unlist() |> table()
    s <- ifelse(any(s == 2), TRUE, FALSE)
    return(s)
  })
sum(s2)

[1] 763