Traffic signal color

83.1% acceptance

May 13, 2026

You are given an integer timer representing the remaining time (in seconds) on a traffic signal. The signal follows these rules: If timer == 0, the signal is "Green" If timer == 30, the signal is "Orange" If 30 < timer <= 90, the signal is "Red" Return the current state of the signal. If none of the above conditions are met, return "Invalid".

Solution

Rust

Time O(1)

Space O(1)

LeetCode

solution.rs

impl Solution {
  pub fn traffic_signal(timer: i32) -> String {
    if timer == 0 { "Green".to_string() }
    else if timer == 30 { "Orange".to_string() }
    else if timer > 30 && timer <= 90 { "Red".to_string() }
    else { "Invalid".to_string() }
  }
}