diff --git a/storage/cf/rs/round-1087-A.rs b/storage/cf/rs/round-1087-A.rs
new file mode 100644
index 0000000..09b8347
--- /dev/null
+++ b/storage/cf/rs/round-1087-A.rs
@@ -0,0 +1,42 @@
+use std::io::{read_to_string, stdin};
+
+fn main() {
+    let temp = read_to_string(stdin()).unwrap();
+    let mut iter = temp
+        .split_ascii_whitespace()
+        .map(|x| x.parse::<usize>().unwrap());
+
+    let t = iter.next().unwrap();
+    (0..t).for_each(|_| {
+        let (n, mut c, mut k) = (
+            // number, combat power, k of flip flop
+            iter.next().unwrap(),
+            iter.next().unwrap(),
+            iter.next().unwrap(),
+        );
+
+        let mut arr = (0..n).map(|_| iter.next().unwrap()).collect::<Vec<_>>();
+        arr.sort();
+        loop {
+            let key = arr.binary_search(&c);
+            match key {
+                Ok(idx) => {
+                    c += arr[idx];
+                    arr.remove(idx);
+                }
+                Err(idx) => {
+                    if idx == 0 {
+                        break;
+                    } else {
+                        let delta = c - arr[idx - 1];
+                        let consume = if k >= delta { delta } else { k };
+                        k -= consume;
+                        c += consume + arr[idx - 1];
+                        arr.remove(idx - 1);
+                    }
+                }
+            }
+        }
+        println!("{}", c);
+    });
+}
diff --git a/storage/cf/rs/round-1087-B.rs b/storage/cf/rs/round-1087-B.rs
new file mode 100644
index 0000000..145af8b
--- /dev/null
+++ b/storage/cf/rs/round-1087-B.rs
@@ -0,0 +1,37 @@
+use std::io::{read_to_string, stdin};
+
+fn main() {
+    let temp = read_to_string(stdin()).unwrap();
+    let mut iter = temp
+        .split_ascii_whitespace()
+        .map(|x| x.parse::<i64>().unwrap());
+
+    let t = iter.next().unwrap();
+    (0..t).for_each(|_| {
+        let n = iter.next().unwrap() as usize;
+        let arr = (0..n).map(|_| iter.next().unwrap()).collect::<Vec<_>>();
+
+        // if n == 1 return 0
+        for i in 0..n {
+            if i == n - 1 {
+                print!("{} ", 0);
+                continue;
+            }
+
+            let key = arr[i];
+
+            let mut cnt_lo = 0;
+            let mut cnt_hi = 0;
+
+            for &e in arr[(i + 1)..n].iter() {
+                if e > key {
+                    cnt_hi += 1;
+                } else if e < key {
+                    cnt_lo += 1;
+                }
+            }
+            print!("{} ", std::cmp::max(cnt_lo, cnt_hi));
+        }
+        println!();
+    });
+}
diff --git a/storage/cf/rs/round-1087-C.rs b/storage/cf/rs/round-1087-C.rs
new file mode 100644
index 0000000..c09e1e2
--- /dev/null
+++ b/storage/cf/rs/round-1087-C.rs
@@ -0,0 +1,54 @@
+use std::io::{Write, stdin, stdout};
+
+fn client(n: usize) {
+    let mut line = String::new();
+    for i in 0..n - 1 {
+        let left = 2 * i + 1;
+        let right = 2 * i + 2;
+
+        println!("? {} {}", left, right);
+        stdout().flush().unwrap();
+        line.clear();
+        stdin().read_line(&mut line).unwrap();
+        let q = line.trim().parse::<usize>().unwrap();
+        if q == 1 {
+            println!("! {}", left);
+            stdout().flush().unwrap();
+            return;
+        }
+    }
+
+    println!("? {} {}", 2 * n - 1, 2 * n - 2);
+    stdout().flush().unwrap();
+    line.clear();
+    stdin().read_line(&mut line).unwrap();
+    let q = line.trim().parse::<usize>().unwrap();
+    if q == 1 {
+        println!("! {}", 2 * n - 1);
+        stdout().flush().unwrap();
+        return;
+    }
+    println!("? {} {}", 2 * n - 1, 2 * n - 3);
+    stdout().flush().unwrap();
+    line.clear();
+    stdin().read_line(&mut line).unwrap();
+    let q = line.trim().parse::<usize>().unwrap();
+    if q == 1 {
+        println!("! {}", 2 * n - 1);
+        stdout().flush().unwrap();
+        return;
+    }
+    println!("! {}", 2 * n);
+}
+
+fn main() {
+    let mut line = String::new();
+    stdin().read_line(&mut line).unwrap();
+    let t = line.trim().parse::<usize>().unwrap();
+    (0..t).for_each(|_| {
+        line.clear();
+        stdin().read_line(&mut line).unwrap();
+        let n = line.trim().parse::<usize>().unwrap();
+        client(n);
+    });
+}