2023 Day 1 Part 1

leibi · Dec 6, 2023 · 03f162b · 03f162b
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diff --git a/src/main/java/net/leibi/adventofcode2023/day1/Day1.java b/src/main/java/net/leibi/adventofcode2023/day1/Day1.java
@@ -0,0 +1,26 @@
+package net.leibi.adventofcode2023.day1;
+
+import lombok.extern.slf4j.Slf4j;
+
+import java.util.stream.IntStream;
+
+@Slf4j
+public class Day1 {
+    public Integer getSumOfCalibrationValues(String small) {
+        return small
+                .lines()
+                .map(this::getCalibrationValue)
+                .flatMapToInt(IntStream::of)
+                .sum();
+    }
+
+    private Integer getCalibrationValue(String line) {
+        //1abc2
+        var numbers = line.chars()
+                .filter(i -> i > 48 && i <= 57) // numbers
+                .map(i -> i - 48)
+                .toArray();
+        log.info("{} -> {}: {}", line, numbers, numbers.length);
+        return numbers[0] * 10 + numbers[numbers.length - 1];
+    }
+}