Work on assignment 3

src/main.rs

@@ -1,4 +1,7 @@
 mod merge_sort;
+mod quick_sort;
+
+use crate::quick_sort::quick_sort;
 use crate::merge_sort::merge_sort_inversions;
 use std::fs::File;
 use std::io;
@@ -20,13 +23,29 @@ fn read_to_vector(path: &str) -> Result<Vec<i64>, io::Error> {
     Ok(v)
 }
 
+#[allow(dead_code)]
 fn c1a2() {
-    let vec = read_to_vector("data/week_2_assignment_2.txt").unwrap();
+    let vec = read_to_vector("data/course_1_assignment_2.txt").unwrap();
     let (_sorted, inversions) = merge_sort_inversions(vec);
-    // println!("{:?}", sorted.len());
     println!("course 1 assignment 2: {:?}", inversions);
 }
 
-fn main() {
-    c1a2();
+fn c1a3() {
+    // let mut vec = read_to_vector("data/course_1_assignment_3.txt").unwrap();
+    let mut vec = vec![2, 20, 1, 15, 3, 11, 13, 6, 16, 10, 19, 5, 4, 9, 8, 14, 18, 17, 7, 12];
+    let mut comp_acc: usize = 0;
+    quick_sort(&mut vec, &mut comp_acc);
+    // println!("{:?}", vec);
+    println!("{:?}", comp_acc);
+    println!("{:?}", 3/2);
+    /*
+    	1: 162085
+		2: 164123
+		3: ?
+    */
+}
+
+fn main() {
+    //c1a2();
+    c1a3();
 }

src/quick_sort.rs

@@ -0,0 +1,61 @@
+use std::cmp::PartialOrd;
+
+
+#[allow(dead_code)]
+fn median_of_three<T: PartialOrd + std::fmt::Debug>( v: &[T]) -> usize {
+	if v.len() < 3 {
+		return 0;
+	}
+
+	let left = 0;
+	let middle = if v.len() % 2 == 0 {
+		v.len() / 2 - 1
+	} else {
+		v.len() / 2
+	};
+	let right = v.len() - 1;
+ 
+	/* TODO: finish here */
+	return 0;
+}
+
+#[allow(dead_code)]
+fn bubble_sort<T: PartialOrd>( v: &mut [T]) -> () {
+	let mut unsorted = true;
+	if v.len() <= 1 {
+		return
+	}
+	while unsorted {
+		unsorted = false;
+		for i in 0..v.len() - 1 {
+			if v[i] > v[i + 1] {
+				v.swap(i, i + 1);
+				unsorted = true;
+			}
+		}
+	}
+
+}
+
+pub fn quick_sort<T: PartialOrd + std::fmt::Debug>( v: &mut [T], comp_acc: &mut usize) -> () {
+    if v.len() <= 1 {
+    	return;
+    }
+    // let pivot_index = 0;
+    // let pivot_index = v.len() - 1;
+    let pivot_index = median_of_three(&v);
+    let mut i = 1;
+    v.swap(0, pivot_index);
+    for j in 1..v.len() {
+    	if v[j] < v[0] {
+    		v.swap(i, j);
+    		i += 1;
+    	}
+    }
+    v.swap(0, i - 1);
+    quick_sort(&mut v[..i - 1], comp_acc);
+    quick_sort(&mut v[i..], comp_acc);
+
+    *comp_acc += v[..i - 1].len();
+    *comp_acc += v[i..].len();
+}