Added 2022, first few problems

3 files changed, 35 insertions, 0 deletions

diff --git a/2022/04/a.rs b/2022/04/a.rs
new file mode 100644
index 0000000..d69821a
--- /dev/null
+++ b/2022/04/a.rs
@@ -0,0 +1,7 @@
+mod common;
+use common::*;
+
+fn main() {
+    let contained = |a: (i64, i64), b: (i64, i64)| a.0 >= b.0 && a.1 <= b.1;
+    println!("{}", count(|a, b| contained(a, b) || contained(b, a)));
+}
diff --git a/2022/04/b.rs b/2022/04/b.rs
new file mode 100644
index 0000000..2affb65
--- /dev/null
+++ b/2022/04/b.rs
@@ -0,0 +1,8 @@
+mod common;
+use common::*;
+
+fn main() {
+    let overlap = |a: (i64, i64), b: (i64, i64)|
+        (a.0 >= b.0 && a.0 <= b.1) || (b.0 >= a.0 && b.0 <= a.1);
+    println!("{}", count(overlap));
+}
diff --git a/2022/04/common.rs b/2022/04/common.rs
new file mode 100644
index 0000000..92c32f1
--- /dev/null
+++ b/2022/04/common.rs
@@ -0,0 +1,20 @@
+fn get_ints(line: &str) -> ((i64, i64), (i64, i64)) {
+    let i = line.find('-').unwrap();
+    let j = line.find(',').unwrap();
+    let k = line[j..].find('-').unwrap() + j;
+    ((line[..i].parse().unwrap(), line[i+1..j].parse().unwrap()),
+     (line[j+1..k].parse().unwrap(), line[k+1..line.len()-1].parse().unwrap()))
+}
+
+pub fn count<F: Fn((i64, i64), (i64, i64)) -> bool>(condition: F) -> i64 {
+    let mut line = String::new();
+    let mut sum = 0;
+    while std::io::stdin().read_line(&mut line).unwrap() > 0 {
+        let (a, b) = get_ints(&line);
+        if condition(a, b) {
+            sum += 1;
+        }
+        line.clear();
+    }
+    sum
+}