add start line

Author: songyzh

src/solution/s0074_search_a_2d_matrix.rs

@@ -36,6 +36,8 @@
  */
 pub struct Solution {}
 
+// submission codes start here
+
 impl Solution {
     pub fn search_matrix(matrix: Vec<Vec<i32>>, target: i32) -> bool {
         if matrix.is_empty() {

src/solution/s0086_partition_list.rs

@@ -16,6 +16,8 @@
 pub struct Solution {}
 use crate::util::linked_list::{to_list, ListNode};
 
+// submission codes start here
+
 impl Solution {
     pub fn partition(head: Option<Box<ListNode>>, x: i32) -> Option<Box<ListNode>> {
         let mut lower = Some(Box::new(ListNode::new(0)));

src/solution/s0149_max_points_on_a_line.rs

@@ -38,6 +38,8 @@
 pub struct Solution {}
 use crate::util::point::Point;
 
+// submission codes start here
+
 /*
 要回顾下高中数学：已知两点, 求解一般式: