Use get_unchecked

Author: EbbDrop

src/day7.rs

@@ -21,6 +21,10 @@ fn search(target: u64, v: &[u64]) -> bool {
 
 #[aoc(day7, part1)]
 pub fn part1(s: &str) -> u64 {
+    unsafe { part1_inner(s) }
+}
+
+unsafe fn part1_inner(s: &str) -> u64 {
     let s = s.as_bytes();
 
     let mut sum = 0;
@@ -29,23 +33,23 @@ pub fn part1(s: &str) -> u64 {
     let mut v = Vec::new();
     while i < s.len() {
         let mut target: u64 = 0;
-        while s[i] != b':' {
+        while *s.get_unchecked(i) != b':' {
             target *= 10;
-            target += (s[i] - b'0') as u64;
+            target += (*s.get_unchecked(i) - b'0') as u64;
             i += 1;
         }
         i += 2;
 
         let mut num = 0;
-        while s[i] != b'\n' {
+        while *s.get_unchecked(i) != b'\n' {
             num *= 10;
-            num += (s[i] - b'0') as u64;
+            num += (*s.get_unchecked(i) - b'0') as u64;
             i += 1;
-            if !s[i].is_ascii_digit() {
+            if !s.get_unchecked(i).is_ascii_digit() {
                 v.push(num);
                 num = 0;
                 i += 1;
-                if s[i - 1] == b'\n' {
+                if *s.get_unchecked(i - 1) == b'\n' {
                     break;
                 }
             }