add cf round-1087-{A,B,C}.rs

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);
+    });
+}