Circular sentence

String

70.2% acceptance

Feb 25, 2026

761

A sentence is circular if the last character of each word equals the first character of its next word, and the last character of the last word equals the first character of the first word.

Solution

Rust

Time O(n)

Space O(1)

LeetCode

solution.rs

impl Solution {
  pub fn is_circular_sentence(sentence: String) -> bool {
    let b = sentence.as_bytes();
    let n = b.len();
    if b[0] != b[n - 1] { return false; }
    for i in 0..n - 1 {
      if b[i] == b' ' && b[i - 1] != b[i + 1] { return false; }
    }
    true
  }
}