complete 15407.rs 24305.rs

storage/zeta/rs/completed/15407.rs

@@ -0,0 +1,30 @@
+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 n = iter.next().unwrap();
+    let mut ta = iter.next().unwrap();
+    let mut tv = 0;
+    let mut items = (0..n)
+        .map(|_| (iter.next().unwrap(), iter.next().unwrap()))
+        .collect::<Vec<_>>();
+
+    items.sort();
+
+    while ta > 0 && items.len() > 0 {
+        let (v, a) = items.pop().unwrap();
+        if a >= ta {
+            tv += v * ta;
+            ta = 0;
+        } else {
+            tv += v * a;
+            ta -= a;
+        }
+    }
+
+    println!("{}", tv);
+}