Problem 8: ruby rewrite

problems/8-string-to-integer/Cargo.lock

@@ -1,7 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-version = 3
-
-[[package]]
-name = "string-to-integer"
-version = "0.1.0"

problems/8-string-to-integer/Cargo.toml

@@ -1,8 +0,0 @@
-[package]
-name = "string-to-integer"
-version = "0.1.0"
-edition = "2021"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
-[dependencies]

problems/8-string-to-integer/main.rb

@@ -0,0 +1,55 @@
+def my_atoi(s)
+  res = 0
+  sign = 1
+  sign_was_scanned = false
+  digit_was_scanned = false
+
+  i32_min = -2_147_483_648
+  i32_max = 2_147_483_647
+
+  s.each_char do |c|
+    if c >= '0' && c <= '9'
+      digit_was_scanned = true
+      conv = c.ord - '0'.ord
+      
+      # Add new digit
+      res = res * 10 + conv * sign
+      
+      # Test overflow
+      return i32_max if sign > 0 && res > i32_max
+      return i32_min if sign < 0 && res < i32_min
+      
+    
+    # First '-'
+    elsif c == '-' && sign_was_scanned == false && digit_was_scanned == false
+      sign_was_scanned = true
+      sign *= -1
+
+    # First '+'
+    elsif c == '+' && sign_was_scanned == false && digit_was_scanned == false
+      sign_was_scanned = true
+    
+    # Repeated '-' or '-' after number
+    elsif c == '-'
+      return res
+    
+    # Repeated '+' or '+' after number
+    elsif c == '+'
+      return res
+    
+    # Letters before number
+    elsif c != '+' && c != ' ' && digit_was_scanned == false
+      return 0
+    
+    # Space after sign
+    elsif c == ' ' && sign_was_scanned
+      return res
+    
+    # Letters after number
+    elsif digit_was_scanned == true
+      return res
+    end
+  end
+
+  res
+end

problems/8-string-to-integer/src/lib.rs

@@ -1,148 +0,0 @@
-use std::convert::TryInto;
-
-pub struct Solution{}
-
-impl Solution {
-    pub fn my_atoi(s: String) -> i32 {
-        let mut res: i32 = 0;
-        let mut sign: i32 = 1;
-        let mut sign_was_scanned = false;
-        let mut digit_was_scanned = false;
-
-        for c in s.chars() {
-            if c >= '0' && c <= '9' {
-                digit_was_scanned = true;
-                let conv: i32 = c.to_digit(10).unwrap().try_into().unwrap();
-                // Test overflow
-                if sign > 0 && res > (i32::MAX - conv * sign) / 10 {
-                    return i32::MAX;
-                }
-                if sign < 0 && res < (i32::MIN - conv * sign) / 10 {
-                    return i32::MIN;
-                }
-                // Add new digit
-                res = res * 10 + conv * sign;
-            }
-            // First '-'
-            else if c == '-' && sign_was_scanned == false && digit_was_scanned == false {
-                sign_was_scanned = true;
-                sign *= -1;
-            }
-            // Repeated '-' or '-' after number
-            else if c == '-' {
-                return res;
-            }
-            // First '+'
-            else if c == '+' && sign_was_scanned == false && digit_was_scanned == false {
-                sign_was_scanned = true;
-            }
-            // Repeated '+' or '+' after number
-            else if c == '+' {
-                return res;
-            }
-            // Letters before number
-            else if c != '+' && c != ' ' && digit_was_scanned == false {
-                return 0;
-            }
-            // Space after sign
-            else if c == ' ' && sign_was_scanned {
-                return res;
-            }
-            // Letters after number
-            else if digit_was_scanned == true {
-                return res;
-            }
-        }
-
-        return res;
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_simple_string() {
-        let input = String::from("42");
-        let result = Solution::my_atoi(input);
-        assert_eq!(result, 42);
-    }
-
-    #[test]
-    fn test_spaces() {
-        let input = String::from("   -42");
-        let result = Solution::my_atoi(input);
-        assert_eq!(result, -42);
-    }
-
-    #[test]
-    fn test_words() {
-        let input = String::from("4193 with words");
-        let result = Solution::my_atoi(input);
-        assert_eq!(result, 4193);
-    }
-
-    #[test]
-    fn test_zeros() {
-        let input = String::from("0032");
-        let result = Solution::my_atoi(input);
-        assert_eq!(result, 32);
-    }
-
-    #[test]
-    fn test_max_int() {
-        let input = String::from("21474242483648");
-        let result = Solution::my_atoi(input);
-        assert_eq!(result, i32::MAX);
-    }
-
-    #[test]
-    fn test_min_int() {
-        let input = String::from("-2424147483649");
-        let result = Solution::my_atoi(input);
-        assert_eq!(result, i32::MIN);
-    }
-
-    #[test]
-    fn test_invalid_string() {
-        let input = String::from("words and 987");
-        let result = Solution::my_atoi(input);
-        assert_eq!(result, 0);
-    }
-
-    #[test]
-    fn test_garbage_after_number() {
-        let input = String::from("3.14159");
-        let result = Solution::my_atoi(input);
-        assert_eq!(result, 3);
-    }
-
-    #[test]
-    fn test_multiple_signs() {
-        let input = String::from("+-12");
-        let result = Solution::my_atoi(input);
-        assert_eq!(result, 0);
-    }
-
-    #[test]
-    fn test_sign_after_number() {
-        let input = String::from("00000-42a1234");
-        let result = Solution::my_atoi(input);
-        assert_eq!(result, 0);
-    }
-
-    #[test]
-    fn test_minus_after_negative_number() {
-        let input = String::from("-5-");
-        let result = Solution::my_atoi(input);
-        assert_eq!(result, -5);
-    }
-
-    #[test]
-    fn test_space_after_sign() {
-        let input = String::from("  +  413");
-        let result = Solution::my_atoi(input);
-        assert_eq!(result, 0);
-    }
-}

problems/8-string-to-integer/test.rb

@@ -0,0 +1,52 @@
+require_relative 'main'
+require 'test/unit'
+
+class TestStringToInt < Test::Unit::TestCase
+  def test_simple_string
+    assert_equal(42, my_atoi('42'))
+  end
+
+  def test_spaces
+    assert_equal(-42, my_atoi('   -42'))
+  end
+
+  def test_words_after_number
+    assert_equal(4193, my_atoi('4193 with words'))
+  end
+
+  def test_zeros
+    assert_equal(32, my_atoi('0032'))
+  end
+
+  def test_max_int
+    assert_equal(2_147_483_647, my_atoi('2147483648'))
+  end
+
+  def test_min_int
+    assert_equal(-2_147_483_648, my_atoi('-2147483649'))
+  end
+
+  def test_invalid_string
+    assert_equal(0, my_atoi('words and 987'))
+  end
+
+  def test_garbage_after_number
+    assert_equal(3, my_atoi('3.14748'))
+  end
+
+  def test_multiple_signs
+    assert_equal(0, my_atoi('+-12'))
+  end
+
+  def test_sign_after_number
+    assert_equal(0, my_atoi('00000-42a1234'))
+  end
+
+  def test_minus_after_negative_number
+    assert_equal(-5, my_atoi('-5-'))
+  end
+
+  def test_space_after_sign
+    assert_equal(0, my_atoi('   +   413'))
+  end
+end

readme.md

@@ -1,18 +1,11 @@
-# Leetcode
+# Rubycode
+
+Solutions of leetcode problems in Ruby.
 
 - [My profile](https://leetcode.com/ordinary-dev/)
 
 ## How to run solutions
 
-For programs written in Rust:
-
-```bash
-cd problems/random-problem
-cargo test
-```
-
-For programs written in Ruby:
-
 ```bash
 cd problems/random-problem
 ruby test.rb
@@ -20,11 +13,5 @@ ruby test.rb
 
 ## Solution structure
 
-For programs written in Rust:
-
-- `src/lib.rs` - solution and tests
-
-For programs written in Ruby:
-
 - `main.rb` - the solution itself
 - `test.rb` - tests