add cf ecr-188 ABCDE

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);
+    });
+}