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Task/ABC-Problem/Rust/abc-problem.rust

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+#![feature(core, unicode)]
+extern crate core;
+extern crate unicode;
+
+use core::iter::repeat;
+use core::str::StrExt;
+use unicode::char::CharExt;
+
+fn rec_can_make_word(index: usize, word: &str, blocks: &[&str], used: &mut[bool]) -> bool {
+	let c = word.char_at(index).to_uppercase();
+	for i in range(0, blocks.len()) {
+		if !used[i] && blocks[i].chars().any(|s| s == c) {
+			used[i] = true;
+			if index == 0 || rec_can_make_word(index - 1, word, blocks, used) {
+				return true;
+			}
+			used[i] = false;
+		}
+	}
+	false
+}
+			
+fn can_make_word(word: &str, blocks: &[&str]) -> bool {
+	return rec_can_make_word(word.char_len() - 1, word, blocks, repeat(false).take(blocks.len()).collect::<Vec<_>>().as_mut_slice());
+}
+
+fn main() {
+	let blocks = [("BO"), ("XK"), ("DQ"), ("CP"), ("NA"), ("GT"), ("RE"), ("TG"), ("QD"), ("FS"), ("JW"), ("HU"), ("VI"), ("AN"), ("OB"), ("ER"), ("FS"), ("LY"), ("PC"), ("ZM")];	
+	let words = ["A", "BARK", "BOOK", "TREAT", "COMMON", "SQUAD", "CONFUSE"];
+	for word in words.iter() {
+		println!("{} -> {}", word, can_make_word(word.as_slice(), blocks.as_slice()))
+	}
+}