87 lines
2.3 KiB
Rust
87 lines
2.3 KiB
Rust
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impl Solution {
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fn can_stamp(stamp: &Vec<char>, tape: &Vec<char>, i: usize) -> bool {
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!Solution::is_fully_stamped_section(stamp.len(), &tape, i)
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&& (0..stamp.len())
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.map(|j| (stamp[j], tape[i + j]))
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.all(|(s, t)| s == t || t == '?')
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}
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fn is_fully_stamped_section(length: usize, tape: &Vec<char>, i: usize) -> bool {
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(i..i + length).all(|j| tape[j] == '?')
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}
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fn stamp_tape(length: usize, tape: &mut Vec<char>, i: usize) {
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(i..i + length).for_each(|j| {
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tape[j] = '?';
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})
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}
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pub fn moves_to_stamp(stamp: String, target: String) -> Vec<i32> {
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// convert stamp to usable interpretation
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let stamp: Vec<char> = stamp.chars().collect();
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// convert target to a mutable array of characters
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let mut tape: Vec<char> = target.chars().collect();
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// keep track of stamped indices
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let mut stamped: Vec<i32> = Vec::new();
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// go over and try to stamp while possible
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let mut has_changed = true;
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while has_changed && stamped.len() <= 10 * tape.len() {
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has_changed = false;
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(0..tape.len() + 1 - stamp.len()).for_each(|i| {
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if Solution::can_stamp(&stamp, &tape, i) {
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Solution::stamp_tape(stamp.len(), &mut tape, i);
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stamped.push(i as i32);
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has_changed = true;
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}
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});
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}
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if stamped.len() > 10 * tape.len()
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|| !Solution::is_fully_stamped_section(tape.len(), &tape, 0)
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{
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stamped.clear();
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}
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stamped.reverse();
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stamped
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}
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}
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struct Solution {}
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fn main() {
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println!("Hello World!");
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_example() {
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assert_eq!(
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Solution::moves_to_stamp("abc".to_string(), "ababc".to_string()),
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vec![0, 2]
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);
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}
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#[test]
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fn test_another_example() {
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assert_eq!(
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Solution::moves_to_stamp("abca".to_string(), "aabcaca".to_string()),
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vec![0, 3, 1]
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);
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}
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#[test]
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fn test_unusable_stamp() {
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assert_eq!(
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Solution::moves_to_stamp("stamp".to_string(), "tamps".to_string()),
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vec![]
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);
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}
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}
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