1 files changed, 20 insertions, 0 deletions

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
+}