Fix Day 1

Brewfile

@@ -0,0 +1,2 @@
+brew "odin"
+# brew "ols"

odin/day01/calories-basic.input

@@ -1,6 +0,0 @@
-1
-10
-1
-
-
-200

odin/day01/day01.odin

@@ -4,6 +4,7 @@ import "core:fmt"
 import "core:os"
 import "core:math"
 import "core:strconv"
+import "core:slice/heap"
 
 scan_to_next :: proc(data: []byte, delim: byte, start_from: int) -> int {
     for idx := start_from; idx < len(data); idx += 1 {
@@ -114,7 +115,7 @@ main :: proc() {
     fh, errno := os.open(os.args[1])
     if errno != os.ERROR_NONE {
         fmt.printf("Cannot open %s: %s\n", os.args[1], os.get_last_error_string())
-        os.exit(int(errno))
+        os.exit(-1)
     }
     defer os.close(fh)
     content, ok := os.read_entire_file_from_handle(fh)
@@ -124,10 +125,17 @@ main :: proc() {
     }
     lines := split_lines(content, '\n')
     total := 0
-    max := 0
+    mh := make([dynamic]int, context.temp_allocator)
+    defer delete(mh)
+    comparator :: proc(a, b: int) -> bool {
+        return a < b
+    }
+    heap.make(mh[:], comparator)
+
     for line, idx in lines {
         if len(line) == 0 {
-            max = math.max(max, total)
+            append(&mh, total)
+            heap.push(mh[:], comparator)
             total = 0
         } else {
             x: int
@@ -140,6 +148,13 @@ main :: proc() {
             }
         }
     }
-    max = math.max(total, max)
-    fmt.printf("Largest grouping: %d\n", max)
-}
+    append(&mh, total)
+    heap.make(mh[:], comparator)
+    total = 0
+    fmt.printf("Largest single value: %d\n", mh[0])
+    for _ in 0..<3 {
+        total += mh[0]
+        heap.pop(mh[:], comparator)
+    }
+    fmt.printf("Sum of three largest: %d\n", total)
+}

odin/day01/test.txt

@@ -0,0 +1,14 @@
+1000
+2000
+3000
+
+4000
+
+5000
+6000
+
+7000
+8000
+9000
+
+10000