49 lines
1.6 KiB
Rust
49 lines
1.6 KiB
Rust
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// A more functional (and much worse imo) solution
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impl Solution {
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#[inline]
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pub fn contains_duplicate(row: &Vec<char>) -> bool {
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let mut map = 0;
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row
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.iter()
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.filter_map(|chr| {
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if *chr != '.' {
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return Some(1 << (*chr as usize - 49));
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}
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None
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})
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.any(|chr| {
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if map & chr != 0 {
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return true;
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}
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map |= chr;
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false
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})
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}
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pub fn is_valid_sudoku(board: Vec<Vec<char>>) -> bool {
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!(
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board.iter() // Rows
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.any(|row| Solution::contains_duplicate(row)) ||
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(0..9).into_iter() // Columns
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.map(|idx| board.iter()
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.map(|row| row[idx])
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.collect::<Vec<char>>()
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)
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.any(|row| Solution::contains_duplicate(&row)) ||
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(0..9).into_iter() // 3 by 3 squares
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.map(|idx| {
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let (row_idx, col_idx) = (idx as usize / 3, idx as usize % 3);
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board.iter()
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.enumerate()
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.filter_map(|(r, row)| {
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if r / 3 == row_idx {
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return Some(row[col_idx*3..(col_idx*3 + 3)].to_vec());
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}
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None
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})
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.flatten()
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.collect::<Vec<char>>()
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})
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.any(|row| Solution::contains_duplicate(&row))
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)
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}
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}
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