implemented kadanes

src/kadanes.rs

@@ -0,0 +1,23 @@
+use std::cmp;
+
+pub fn kadanes(arr: &[i32]) -> (i32, Vec<i32>) {
+    let mut max_so_far = i32::MIN;
+    let mut max_ending_here = 0;
+    let mut start_index = 0;
+    let mut end_index = 0;
+    let mut temp_start_index = 0;
+
+    for (i, &num) in arr.iter().enumerate() {
+        max_ending_here = cmp::max(max_ending_here + num, num);
+        if max_ending_here == num {
+            temp_start_index = i;
+        }
+        if max_so_far < max_ending_here {
+            max_so_far = max_ending_here;
+            start_index = temp_start_index;
+            end_index = i;
+        }
+    }
+
+    (max_so_far, arr[start_index..=end_index].to_vec())
+}