add initial data

0008-string-to-integer-atoi/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "leetcode"
+version = "0.1.0"

0008-string-to-integer-atoi/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "leetcode"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

0008-string-to-integer-atoi/src/main.rs

@@ -0,0 +1,94 @@
+fn main() {
+    println!("Hello, world!");
+}
+pub fn my_atoi(s: String) -> i32 {
+    let mut chars = s.trim().chars().peekable();
+
+    let is_negative = match chars.peek() {
+        Some(&'+') => {
+            chars.next();
+            false
+        }
+        Some(&'-') => {
+            chars.next();
+            true
+        }
+        _ => false,
+    };
+
+    let mut accum: i64 = 0;
+    for c in chars {
+        let Some(digit) = c.to_digit(10) else {
+            break;
+        };
+        accum = accum * 10 - digit as i64;
+        accum = accum.max(i32::MIN as i64);
+    }
+
+    if is_negative {
+        accum as i32
+    } else {
+        (-accum).min(i32::MAX as i64) as i32
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::my_atoi;
+
+    #[test]
+    fn test_1() {
+        assert_eq!(my_atoi("42".to_string()), 42);
+    }
+
+    #[test]
+    fn test_2() {
+        assert_eq!(my_atoi("  -042".to_string()), -42);
+    }
+
+    #[test]
+    fn test_3() {
+        assert_eq!(my_atoi("1337c0d3".to_string()), 1337);
+    }
+
+    #[test]
+    fn test_4() {
+        assert_eq!(my_atoi("0-1".to_string()), 0);
+    }
+
+    #[test]
+    fn test_5() {
+        assert_eq!(my_atoi("words and 987".to_string()), 0);
+    }
+
+    #[test]
+    fn test_6() {
+        assert_eq!(my_atoi((i32::MAX as i64 + 1).to_string()), i32::MAX);
+    }
+
+    #[test]
+    fn test_7() {
+        assert_eq!(my_atoi((i32::MAX).to_string()), i32::MAX);
+    }
+
+    #[test]
+    fn test_8() {
+        assert_eq!(my_atoi("9223372036854775808".to_string()), i32::MAX);
+    }
+
+    #[test]
+    fn test_9() {
+        assert_eq!(
+            my_atoi("1234567890123456789012345678901234567890".to_string()),
+            i32::MAX
+        );
+    }
+
+    #[test]
+    fn test_10() {
+        assert_eq!(
+            my_atoi("10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000522545459".to_string()),
+            i32::MAX
+        );
+    }
+}