Ruby: use x...y instead of x..y-1

advent-of-code/2024/day_06/lib.rb

@@ -79,8 +79,8 @@ def make_step(matrix, i, j)
 end
 
 def get_current_position(matrix)
-  for i in 0..matrix.length - 1 do
-    for j in 0..matrix[i].length - 1 do
+  for i in 0...matrix.length do
+    for j in 0...matrix[i].length do
       return [i, j] if ['^', '>', 'v', '<'].include?(matrix[i][j])
     end
   end
@@ -94,8 +94,8 @@ def count_possible_obstructions(matrix)
   start_i, start_j = get_current_position(matrix)
   start_symbol = matrix[start_i][start_j]
 
-  for i in 0..matrix.length - 1 do
-    for j in 0..matrix[i].length - 1 do
+  for i in 0...matrix.length do
+    for j in 0...matrix[i].length do
       next if matrix[i][j] != '.'
 
       matrix[i][j] = '#'

advent-of-code/2024/day_08/lib.rb

@@ -14,8 +14,8 @@ def count_antinodes(matrix, limit_length)
   antinodes = Array.new(matrix.length) { Array.new(matrix[0].length, 0) }
 
   station_coords.each_value do |loc|
-    (0..loc.length - 2).each do |i|
-      (i + 1..loc.length - 1).each do |j|
+    (0...loc.length - 1).each do |i|
+      (i + 1...loc.length).each do |j|
         x_diff = loc[j].x - loc[i].x
         y_diff = loc[j].y - loc[i].y
 
@@ -69,8 +69,8 @@ end
 def extract_stations(matrix)
   station_coords = {}
 
-  (0..matrix.length - 1).each do |x|
-    (0..matrix[x].length - 1).each do |y|
+  (0...matrix.length).each do |x|
+    (0...matrix[x].length).each do |y|
       ch = matrix[x][y]
       next if ch == '.'
 

advent-of-code/2024/day_10/lib.rb

@@ -9,8 +9,8 @@ end
 def get_score_sum(matrix, skip_visited_cells)
   count = 0
 
-  for i in 0..matrix.length - 1 do
-    for j in 0..matrix[0].length - 1 do
+  for i in 0...matrix.length do
+    for j in 0...matrix[0].length do
       next if matrix[i][j] != 0
 
       count += bfs(matrix, i, j, skip_visited_cells)