diff options
Diffstat (limited to 'most_stones_remove.rs')
-rw-r--r-- | most_stones_remove.rs | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/most_stones_remove.rs b/most_stones_remove.rs new file mode 100644 index 0000000..8dc890d --- /dev/null +++ b/most_stones_remove.rs @@ -0,0 +1,49 @@ +use std::collections::HashMap; +struct Solution; + +impl Solution { + pub fn remove_stones(stones: Vec<Vec<i32>>) -> i32 { + let mut ans = 0; + let mut parent: Vec<usize> = (0..stones.len()).collect(); + let mut rows: HashMap<i32, usize> = HashMap::new(); + let mut cols: HashMap<i32, usize> = HashMap::new(); + for (i, v) in stones.iter().enumerate() { + match rows.get(&v[0]) { + Some(&j) => if Self::union_stone(i, j, &mut parent) { + ans += 1; + } + None => { rows.insert(v[0], i); } + } + match cols.get(&v[1]) { + Some(&j) => if Self::union_stone(i, j, &mut parent) { + ans += 1; + } + None => { cols.insert(v[1], i); } + } + } + ans + } + fn union_stone(i: usize, j: usize, parent: &mut Vec<usize>) -> bool { + let i_root = Self::find_set(i, parent); + let j_root = Self::find_set(j, parent); + parent[i_root] = j_root; + i_root != j_root + } + fn find_set(x: usize, parent: &mut Vec<usize>) -> usize { + if x != parent[x] { + parent[x] = Self::find_set(parent[x], parent); + } + parent[x] + } +} + +fn main() { + let stones = vec![ + vec![0,0], + vec![0,1], + vec![1,0], + vec![1,2], + vec![2,1], + vec![2,2]]; + print!("{}", Solution::remove_stones(stones)); +} |