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struct Solution;
impl Solution {
fn push_dominoes(dominoes: String) -> String {
let mut dot = 0;
let mut right = false;
let mut res = "".to_string();
for c in dominoes.chars().chain("R".chars()) {
match c {
'R' => {
if dot > 0 {
if right {
for _ in 0..=dot {
res.push('R');
}
} else {
for _ in 0..dot {
res.push('.');
}
}
dot = 0;
} else {
if right {
res.push('R');
}
}
right = true;
}
'L' => {
if !right {
for _ in 0..1 + dot {
res.push('L');
}
} else {
for _ in 0..=dot / 2 {
res.push('R');
}
if dot % 2 == 1 {
res.push('.');
}
for _ in 0..=dot / 2 {
res.push('L');
}
}
right = false;
dot = 0;
}
_ => {
dot += 1;
}
}
}
res
}
}
#[test]
fn test() {
let dominoes = ".L.R...LR..L..".to_string();
let res = "LL.RR.LLRRLL..".to_string();
assert_eq!(Solution::push_dominoes(dominoes), res);
let dominoes = "RR.L".to_string();
let res = "RR.L".to_string();
assert_eq!(Solution::push_dominoes(dominoes), res);
let dominoes = "R".to_string();
let res = "R".to_string();
assert_eq!(Solution::push_dominoes(dominoes), res);
}