Merge branch 'main' into hld_nits

Cargo.toml

@@ -197,8 +197,16 @@ name = "lis_yosupo"
 path = "examples/helpers/lis_yosupo.rs"
 
 [[example]]
-name = "lis_pop"
-path = "examples/helpers/lis_pop.rs"
+name = "lis_handmade"
+path = "examples/helpers/lis_handmade.rs"
+
+[[example]]
+name = "range_container_aizu"
+path = "examples/data_structures/range_container_aizu.rs"
+
+[[example]]
+name = "range_container_handmade"
+path = "examples/data_structures/range_container_handmade.rs"
 
 [[example]]
 name = "mono_st"
@@ -222,4 +230,8 @@ path = "examples/data_structures/disjoint_rmq_non_commutative.rs"
 
 [[example]]
 name = "lca_rmq_next_on_path"
-path = "examples/graphs/lca_rmq_next_on_path.rs"
+path = "examples/graphs/lca_rmq_next_on_path.rs"
+
+[[example]]
+name = "linear_rmq"
+path = "examples/data_structures/linear_rmq.rs"

examples/README.md

@@ -2,6 +2,7 @@
 - tests are named `[algo].rs`
 - use both yosupo and aizu to test whenever possible because bugs have existed on one of the sites but not the other
 - when using both sites name the files `[algo]_yosupo.rs` and `[algo]_aizu.rs`
+- when there's no problem to test on, test on [hello world](https://onlinejudge.u-aizu.ac.jp/courses/lesson/2/ITP1/all/ITP1_1_A) and name the files `[algo]_handmade.rs`
 - when only testing a specific function or componenet of some algorithm name the file `[algo]_[component].rs`
 
 # Documentation Guidelines

examples/data_structures/linear_rmq.rs

@@ -0,0 +1,25 @@
+// verification-helper: PROBLEM https://judge.yosupo.jp/problem/staticrmq
+
+use proconio::input;
+use programming_team_code_rust::data_structures::linear_rmq::LinearRMQ;
+
+fn main() {
+    input! {
+        n: usize,
+        q: usize,
+        a: [usize; n],
+    }
+
+    let rmq = LinearRMQ::new(&a, |&x, &y| x.lt(&y));
+    for _ in 0..q {
+        input! {
+            le: usize,
+            ri: usize,
+        }
+        let idx_min = rmq.query_idx(le..ri);
+        assert!((le..ri).contains(&idx_min));
+        let res = rmq.query(le..ri);
+        assert_eq!(a[idx_min], *res);
+        println!("{}", res);
+    }
+}

examples/data_structures/range_container_aizu.rs

@@ -0,0 +1,45 @@
+// verification-helper: PROBLEM https://onlinejudge.u-aizu.ac.jp/problems/DSL_2_D
+
+use proconio::input;
+use programming_team_code_rust::data_structures::range_container::RangeContainer;
+
+fn main() {
+    input! {
+        n: usize,
+        q: usize,
+    }
+    let mut rc = RangeContainer::default();
+    let mut to_value = vec![i32::MAX; 2 * n + 2];
+    rc.insert_range(0..(2 * n + 1) as i32);
+
+    for _ in 0..q {
+        input! {
+            kind: usize,
+        }
+        match kind {
+            0 => {
+                input! {
+                    le: i32,
+                    ri: i32,
+                    x: i32,
+                }
+                let le = 2 * le;
+                let ri = 2 * ri;
+                let save_range = rc.get_range(ri + 2).unwrap();
+                let save_value = to_value[save_range.start as usize];
+                rc.remove_range(le - 1..ri + 2);
+                rc.insert_range(le..ri + 1);
+                let save_range = rc.get_range(ri + 2).unwrap();
+                to_value[save_range.start as usize] = save_value;
+                to_value[le as usize] = x;
+            }
+            _ => {
+                input! {
+                    index: i32,
+                }
+                let range_containing = rc.get_range(2 * index).unwrap();
+                println!("{}", to_value[range_containing.start as usize]);
+            }
+        }
+    }
+}

examples/data_structures/range_container_handmade.rs

@@ -0,0 +1,64 @@
+// verification-helper: PROBLEM https://onlinejudge.u-aizu.ac.jp/courses/lesson/2/ITP1/all/ITP1_1_A
+
+use programming_team_code_rust::data_structures::range_container::RangeContainer;
+use rand::{thread_rng, Rng};
+use std::collections::BTreeMap;
+
+fn main() {
+    let mut rng = thread_rng();
+    for _ in 0..100 {
+        let max_n = rng.gen_range(1..100);
+        let mut vis = vec![false; max_n + 1];
+        let mut rc = RangeContainer::default();
+        for _ in 0..100 {
+            let mut le = rng.gen_range(0..=max_n);
+            let mut ri = rng.gen_range(0..=max_n);
+            if le > ri {
+                (le, ri) = (ri, le);
+            }
+            match rng.gen_range(0..2) {
+                0 => {
+                    rc.insert_range(le as i32..ri as i32);
+                    for elem in vis.iter_mut().take(ri).skip(le) {
+                        *elem = true;
+                    }
+                }
+                _ => {
+                    rc.remove_range(le as i32..ri as i32);
+                    for elem in vis.iter_mut().take(ri).skip(le) {
+                        *elem = false;
+                    }
+                }
+            }
+            let mut to_end = vec![None; max_n + 1];
+            for i in (0..max_n).rev() {
+                if vis[i] && !vis[i + 1] {
+                    to_end[i] = Some(i + 1);
+                } else if vis[i] {
+                    to_end[i] = to_end[i + 1];
+                }
+            }
+            let mut naive_mp = BTreeMap::<i32, i32>::new();
+            let mut start = None;
+            for i in 0..max_n + 1 {
+                if vis[i] {
+                    if start.is_none() {
+                        start = Some(i);
+                    }
+                    assert_eq!(
+                        rc.get_range(i as i32).unwrap(),
+                        start.unwrap() as i32..to_end[i].unwrap() as i32
+                    );
+                } else {
+                    assert_eq!(rc.get_range(i as i32), None);
+                    if let Some(curr_start) = start {
+                        naive_mp.insert(curr_start as i32, i as i32);
+                    }
+                    start = None;
+                }
+            }
+            assert_eq!(rc.mp, naive_mp);
+        }
+    }
+    println!("Hello World");
+}

examples/helpers/lis_pop.rs → examples/helpers/lis_handmade.rs

@@ -1,6 +1,7 @@
 // verification-helper: PROBLEM https://onlinejudge.u-aizu.ac.jp/courses/lesson/2/ITP1/all/ITP1_1_A
 
 use programming_team_code_rust::helpers::lis::Lis;
+use rand::{thread_rng, Rng};
 
 fn lis_quadratic(a: &[i32]) -> usize {
     let n = a.len();
@@ -19,13 +20,14 @@ fn lis_quadratic(a: &[i32]) -> usize {
 }
 
 fn main() {
+    let mut rng = thread_rng();
     for _ in 0..100 {
         let mut lis = Lis::default();
         let mut a = Vec::new();
         for _ in 0..1000 {
-            match rand::random::<u8>() % 3 {
+            match rng.gen_range(0..3) {
                 0 => {
-                    let new_num = rand::random::<i32>();
+                    let new_num = rng.r#gen();
                     lis.push(new_num);
                     a.push(new_num);
                 }

src/data_structures/linear_rmq.rs

@@ -0,0 +1,99 @@
+//! # Linear Range Minimum Query
+
+/// # Example
+/// ```
+/// use programming_team_code_rust::data_structures::linear_rmq::LinearRMQ;
+///
+/// let a = [1, 0, 2, 0, 3];
+/// let rmq = LinearRMQ::new(&a, |&x, &y| x.lt(&y)); // lt -> right-most min
+///                                                  // le -> left-most min
+///                                                  // gt -> right-most max
+///                                                  // ge -> left-most max
+/// assert_eq!(rmq.query_idx(0..5), 3);
+/// assert_eq!(*rmq.query(1..5), 0);
+/// ```
+pub struct LinearRMQ<T, F> {
+    a: Vec<T>,
+    cmp: F,
+    head: Vec<usize>,
+    t: Vec<(usize, usize)>,
+}
+
+impl<T: Clone, F: Fn(&T, &T) -> bool> LinearRMQ<T, F> {
+    /// Create a new LinearRMQ instance
+    ///
+    /// # Complexity (n = a.len())
+    /// - Time: O(n)
+    /// - Space: O(n)
+    pub fn new(a: &[T], cmp: F) -> Self {
+        let mut head = vec![0; a.len() + 1];
+        let mut t = vec![(0, 0); a.len()];
+        let mut st = vec![usize::MAX];
+        for i in 0..=a.len() {
+            let mut prev = usize::MAX;
+            while *st.last().unwrap() != usize::MAX
+                && (i == a.len() || !cmp(&a[*st.last().unwrap()], &a[i]))
+            {
+                if prev != usize::MAX {
+                    head[prev] = *st.last().unwrap();
+                }
+                let pw2 = 1 << (st[st.len() - 2].wrapping_add(1) ^ i).ilog2();
+                prev = i & 0_usize.wrapping_sub(pw2);
+                t[*st.last().unwrap()].0 = prev;
+                st.pop();
+                t[(*st.last().unwrap()).wrapping_add(1)].1 |= pw2;
+            }
+            if prev != usize::MAX {
+                head[prev] = i;
+            }
+            st.push(i);
+        }
+        for i in 1..a.len() {
+            t[i].1 =
+                (t[i].1 | t[i - 1].1) & 0_usize.wrapping_sub(t[i].0 & 0_usize.wrapping_sub(t[i].0));
+        }
+        Self {
+            a: a.to_vec(),
+            cmp,
+            head,
+            t,
+        }
+    }
+
+    /// Gets the index of min/max of range
+    ///
+    /// # Complexity
+    /// - Time: O(1)
+    /// - Space: O(1)
+    pub fn query_idx(&self, range: std::ops::Range<usize>) -> usize {
+        assert!(!range.is_empty());
+        let (mut le, mut ri) = (range.start, range.end - 1);
+        let j = self.t[le].1
+            & self.t[ri].1
+            & 0_usize.wrapping_sub(1 << ((self.t[le].0 ^ self.t[ri].0) | 1).ilog2());
+        let lift = |u: usize, mut k: usize| -> usize {
+            if k == 0 {
+                u
+            } else {
+                k = 1 << k.ilog2();
+                self.head[self.t[u].0 & 0_usize.wrapping_sub(k) | k]
+            }
+        };
+        le = lift(le, self.t[le].1 ^ j);
+        ri = lift(ri, self.t[ri].1 ^ j);
+        if (self.cmp)(&self.a[le], &self.a[ri]) {
+            le
+        } else {
+            ri
+        }
+    }
+
+    /// Gets the min/max of range
+    ///
+    /// # Complexity
+    /// - Time: O(1)
+    /// - Space: O(1)
+    pub fn query(&self, range: std::ops::Range<usize>) -> &T {
+        &self.a[self.query_idx(range)]
+    }
+}

src/data_structures/mod.rs

@@ -3,6 +3,8 @@ pub mod binary_trie;
 pub mod disjoint_rmq;
 pub mod fenwick;
 pub mod lazy_seg_tree;
+pub mod linear_rmq;
+pub mod range_container;
 pub mod rmq;
 pub mod seg_tree;
 pub mod trie;