006 ok

006/solution.rs

@@ -0,0 +1,23 @@
+fn main() {
+    {   
+        // SOLUTION 1
+        let mut sum_1 = 0;
+        let mut sum_a = 0;
+        for i in 0..100 {
+            sum_1 += i;
+            sum_a += i * i;
+        }
+        let diff = sum_1 * sum_1 - sum_a;
+        println!("sum_1: {}", sum_1 * sum_1);
+        println!("sum_a: {}", sum_a);
+        println!("solution1: {}", diff);
+    }
+
+    {
+        // SOLUTION 2
+        let n = 99;
+        let solution_2 = ( (n * (n + 1) ) / 2) * ( (n * (n + 1) ) / 2 ) - ( (n * (n + 1) * (2 * n + 1)) / 6 );
+        println!("solution2: {}", solution_2);
+    }
+
+}