add initial data

longest-substring-without-repeating-characters/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "longest-substring-without-repeating-characters"
+version = "0.1.0"

longest-substring-without-repeating-characters/Cargo.toml

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+[package]
+name = "longest-substring-without-repeating-characters"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

longest-substring-without-repeating-characters/src/main.rs

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+fn main() {}
+
+fn length_of_longest_substring(s: String) -> i32 {
+    if s.is_empty() {
+        return 0;
+    }
+
+    let mut char_idx_map = [-1_i64; 128];
+
+    let mut left: usize = 0;
+    let mut right: usize = 1;
+
+    let mut best = 0;
+
+    let bytes = s.as_bytes();
+
+    while right <= s.len() {
+        let last_char = bytes[right - 1];
+
+        let last_seen = char_idx_map[last_char as usize];
+
+        if last_seen >= left as i64 {
+            left = (last_seen + 1) as usize;
+            right = right.max(left + 1);
+        } else {
+            best = best.max(right - left);
+            char_idx_map[last_char as usize] = right as i64 - 1;
+            right += 1;
+        }
+    }
+    best as _
+}
+
+#[cfg(test)]
+mod tests {
+    use super::length_of_longest_substring;
+
+    #[test]
+    fn test1() {
+        assert_eq!(length_of_longest_substring("abcabcbb".to_string()), 3);
+    }
+    #[test]
+    fn test2() {
+        assert_eq!(length_of_longest_substring("bbbbb".to_string()), 1);
+    }
+    #[test]
+    fn test3() {
+        assert_eq!(length_of_longest_substring("pwwkew".to_string()), 3);
+    }
+    #[test]
+    fn test4() {
+        assert_eq!(length_of_longest_substring("".to_string()), 0);
+    }
+    #[test]
+    fn test5() {
+        assert_eq!(length_of_longest_substring("S".to_string()), 1);
+    }
+}