Merge pull request #1289 from xkr47/pwc048-2

xkr47 / 048 / Rust version!

3 files changed, 61 insertions, 0 deletions

diff --git a/challenge-048/xkr47/rust/Cargo.toml b/challenge-048/xkr47/rust/Cargo.toml
new file mode 100644
index 0000000000..297b1f0cd8
--- /dev/null
+++ b/challenge-048/xkr47/rust/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "pwc-048"
+version = "0.1.0"
+authors = ["Jonas Berlin <xkr47@outerspace.dyndns.org>"]
+edition = "2018"
+
+[dependencies]
+chrono = "0.4.10"
+
+[[bin]]
+name = "ch-1"
+path = "ch-1.rs"
+
+[[bin]]
+name = "ch-2"
+path = "ch-2.rs"
diff --git a/challenge-048/xkr47/rust/ch-1.rs b/challenge-048/xkr47/rust/ch-1.rs
new file mode 100644
index 0000000000..f64641edef
--- /dev/null
+++ b/challenge-048/xkr47/rust/ch-1.rs
@@ -0,0 +1,27 @@
+struct Pwc048_1 {
+    array: Vec<i32>,
+    index: usize,
+}
+
+impl Iterator for Pwc048_1 {
+    type Item = i32;
+    fn next(&mut self) -> Option<i32> {
+        let val = self.array[self.index];
+        self.index = (self.index + 1) % self.array.len();
+        self.array.remove(self.index);
+        if !self.array.is_empty() {
+            self.index = self.index % self.array.len();
+            Some(val)
+        } else {
+            None
+        }
+    }
+}
+
+fn main() {
+    let arr = Pwc048_1 {
+        array: (1..=50).collect(),
+        index: 0,
+    };
+    print!("Survivors, in order: {:?} ", arr.collect::<Vec<i32>>());
+}
diff --git a/challenge-048/xkr47/rust/ch-2.rs b/challenge-048/xkr47/rust/ch-2.rs
new file mode 100644
index 0000000000..53168c4cd2
--- /dev/null
+++ b/challenge-048/xkr47/rust/ch-2.rs
@@ -0,0 +1,18 @@
+use chrono::prelude::*;
+use std::iter::FromIterator;
+
+fn main() {
+    let dates: Vec<String> = (2000..=2999)
+        .map(|y| {
+            let ys = y.to_string();
+            let revchars: Vec<char> = ys.chars().rev().collect();
+            let m = String::from_iter(&revchars[0..2]).parse::<u32>().unwrap();
+            let d = String::from_iter(&revchars[2..4]).parse::<u32>().unwrap();
+            chrono::Utc.ymd_opt(y, m, d)
+        })
+        .flat_map(|date| date.earliest())
+        .map(|date| format!("{}", date.format("%m%d%Y")))
+        .collect();
+
+    println!("{:?}", dates);
+}