solve: 1029. Two City Scheduling in rustlang

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

Author: rajput-hemant

src/1001-1100/1029 - Two City Scheduling/two_city_scheduling.rs

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+impl Solution {
+    pub fn two_city_sched_cost(costs: Vec<Vec<i32>>) -> i32 {
+        let mut costs = costs;
+
+        let mut total = 0;
+        let n = costs.len() / 2;
+
+        // sort by a gain which company has
+        // by sending a person to city A and not to city B
+        costs.sort_by(|a, b| (a[0] - a[1]).cmp(&(b[0] - b[1])));
+
+        // to optimize the company expenses,
+        // send the first n persons to the city A
+        // and the others to the city B
+        for i in 0..n {
+            total += costs[i][0] + costs[i + n][1]; // city A + city B
+        }
+
+        total
+    }
+}