solve: 2551. Put Marbles in Bags in rust

Signed-off-by: rajput-hemant <rajput.hemant2001@gmail.com>

Author: rajput-hemant

src/2501-2600/2551 - Put Marbles in Bags/put_marbels_in_bag.rs

@@ -0,0 +1,15 @@
+impl Solution {
+    pub fn put_marbles(weights: Vec<i32>, k: i32) -> i64 {
+        let n = weights.len();
+        // pair weights of adjacent bags
+        let mut pair_weights: Vec<_> = (0..n - 1).map(|i| weights[i] + weights[i + 1]).collect();
+
+        // sort the pair weights
+        pair_weights.sort();
+
+        // sum the difference between the largest and smallest pair weights
+        (0..(k - 1) as usize).fold(0_i64, |ans, i| {
+            ans + (pair_weights[n - 2 - i] - pair_weights[i]) as i64
+        })
+    }
+}