diff --git a/storage/cf/rs/ecr-188-A.rs b/storage/cf/rs/ecr-188-A.rs
new file mode 100644
index 0000000..3e40555
--- /dev/null
+++ b/storage/cf/rs/ecr-188-A.rs
@@ -0,0 +1,28 @@
+use std::io::stdin;
+
+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();
+        line.clear();
+        stdin().read_line(&mut line).unwrap();
+        let arr = line.trim().chars().collect::<Vec<_>>();
+
+        let mut res = 0;
+        for (i, &st) in arr.iter().enumerate() {
+            if st == 'L' {
+                res = i + 1;
+                break;
+            }
+        }
+
+        println!("{}", res);
+    });
+}
diff --git a/storage/cf/rs/ecr-188-B.rs b/storage/cf/rs/ecr-188-B.rs
new file mode 100644
index 0000000..b6948db
--- /dev/null
+++ b/storage/cf/rs/ecr-188-B.rs
@@ -0,0 +1,26 @@
+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 = iter.next().unwrap();
+        let arr = (0..n).map(|_| iter.next().unwrap()).collect::<Vec<_>>();
+        let mut cnt = 0;
+        let mut before_most = 0;
+        for i in 0..n {
+            if arr[i] > before_most {
+                cnt += 1;
+                before_most = arr[i];
+            } else if arr[i] == before_most {
+                cnt += 1;
+            }
+        }
+        println!("{}", cnt);
+    });
+}
diff --git a/storage/cf/rs/ecr-188-C.rs b/storage/cf/rs/ecr-188-C.rs
new file mode 100644
index 0000000..0cb2697
--- /dev/null
+++ b/storage/cf/rs/ecr-188-C.rs
@@ -0,0 +1,94 @@
+use std::io::{read_to_string, stdin};
+
+fn gcd(a: usize, b: usize) -> usize {
+    if b == 0 { a } else { gcd(b, a % b) }
+}
+
+fn lcm(a: usize, b: usize) -> usize {
+    a * b / gcd(a, b)
+}
+
+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 (a, b, c, m) = (
+            iter.next().unwrap(),
+            iter.next().unwrap(),
+            iter.next().unwrap(),
+            iter.next().unwrap(),
+        );
+
+        let l_ab = lcm(a, b);
+        let l_bc = lcm(b, c);
+        let l_ac = lcm(a, c);
+        let l_abc = lcm(l_ab, c);
+        // density of a
+
+        let cnt_a = {
+            let tot = m / a;
+            if tot == 0 {
+                tot
+            } else {
+                let with_b = l_ab / a;
+                let with_c = l_ac / a;
+                let with_bc = l_abc / a;
+                let tot_with_b = tot / with_b;
+                let tot_with_c = tot / with_c;
+                let tot_with_bc = tot / with_bc;
+
+                let res = (tot + tot_with_bc - tot_with_b - tot_with_c) * 6
+                    + (tot_with_b - tot_with_bc) * 3
+                    + (tot_with_c - tot_with_bc) * 3
+                    + (tot_with_bc) * 2;
+                res
+            }
+        };
+
+        let cnt_b = {
+            let tot = m / b;
+            if tot == 0 {
+                tot
+            } else {
+                let with_a = l_ab / b;
+                let with_c = l_bc / b;
+                let with_ac = l_abc / b;
+                let tot_with_a = tot / with_a;
+                let tot_with_c = tot / with_c;
+                let tot_with_ac = tot / with_ac;
+
+                let res = (tot + tot_with_ac - tot_with_a - tot_with_c) * 6
+                    + (tot_with_a - tot_with_ac) * 3
+                    + (tot_with_c - tot_with_ac) * 3
+                    + (tot_with_ac) * 2;
+                res
+            }
+        };
+
+        let cnt_c = {
+            let tot = m / c;
+            if tot == 0 {
+                tot
+            } else {
+                let with_a = l_ac / c;
+                let with_b = l_bc / c;
+                let with_ab = l_abc / c;
+                let tot_with_a = tot / with_a;
+                let tot_with_b = tot / with_b;
+                let tot_with_ab = tot / with_ab;
+
+                let res = (tot + tot_with_ab - tot_with_a - tot_with_b) * 6
+                    + (tot_with_a - tot_with_ab) * 3
+                    + (tot_with_b - tot_with_ab) * 3
+                    + (tot_with_ab) * 2;
+                res
+            }
+        };
+
+        println!("{} {} {}", cnt_a, cnt_b, cnt_c);
+    })
+}
diff --git a/storage/cf/rs/ecr-188-D.rs b/storage/cf/rs/ecr-188-D.rs
new file mode 100644
index 0000000..20eed82
--- /dev/null
+++ b/storage/cf/rs/ecr-188-D.rs
@@ -0,0 +1,36 @@
+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, m) = (iter.next().unwrap(), iter.next().unwrap());
+        let mut res = 0;
+        if m == 0 {
+            res = n;
+        } else {
+            let mut edges = vec![vec![]; n];
+            let mut vis = vec![false; n];
+            for _ in 0..m {
+                let (u, v) = (iter.next().unwrap() - 1, iter.next().unwrap() - 1);
+                edges[u].push(v);
+                edges[v].push(u);
+            }
+
+            let mut deq = vec![];
+            for i in 0..n {
+                deq.push(i);
+            }
+
+            while !deq.is_empty() {
+                let ()
+            }
+
+
+        }
+    });
+}
diff --git a/storage/cf/rs/ecr-188-E.rs b/storage/cf/rs/ecr-188-E.rs
new file mode 100644
index 0000000..801281c
--- /dev/null
+++ b/storage/cf/rs/ecr-188-E.rs
@@ -0,0 +1,19 @@
+use std::io::{read_to_string, stdin};
+
+fn conv(s: &str) -> Vec<usize> {
+    let mut v = vec![0; 10];
+    for ch in s.chars() {
+        v[(ch as usize - '0' as usize) as usize] += 1;
+    }
+    v
+}
+
+fn main() {
+    let temp = read_to_string(stdin()).unwrap();
+    let mut iter = temp.split_ascii_whitespace();
+
+    (0..iter.next().unwrap().parse::<usize>().unwrap()).for_each(|_| {
+        let s = iter.next().unwrap().trim();
+        let cnts = conv(s);
+    })
+}