day 2 done

2024/02/part 1 solution.py

@@ -0,0 +1,56 @@
+with open(r'2024/02\input.txt', 'r') as file:
+    input = file.read()
+
+test_input = '''7 6 4 2 1
+1 2 7 8 9
+9 7 6 2 1
+1 3 2 4 5
+8 6 4 4 1
+1 3 6 7 9'''
+
+# for each line we want to compare the current number to the next number
+# if the number is between 1 and 3 difference it is valid
+# we also need to know and store if it is ascending or descending
+# because all numbers need to be ascending or descending and not mixed
+# this will mean the line is valid
+
+valid_list_count = 0
+
+for line in input.split('\n'):
+    safe = False
+    line = line.split()
+    list_line = [int(i) for i in line]
+
+    # check all numbers in the line are ascending or descending
+    if list_line == sorted(list_line) or list_line == sorted(list_line, reverse=True):
+        #print(list_line, 'ascending or descending')
+        safe = True
+        print(list_line, 'steady')
+    else:
+        safe = False
+        print(list_line, 'unsteady')
+        continue
+
+    for i, num in enumerate(list_line):
+        if i == 0:
+            continue
+        check = abs(num - list_line[i-1])
+        if check >= 4 or check == 0:
+            #print(check)
+            safe = False
+        else:
+            #print(check)
+            safe = True
+        if not safe:
+            print(list_line, 'unsafe, big jumps')
+            break
+
+    if safe:
+        print(list_line, 'safe')
+        valid_list_count += 1
+
+
+
+print(valid_list_count)
+
+#print(valid_list_count)

2024/02/part 2 solution.py

@@ -0,0 +1,89 @@
+testing = 0
+
+if testing == 0: 
+    with open(r'2024/02\input.txt', 'r') as file:
+        input = file.read()
+else:
+    input = '''7 6 4 2 1
+1 2 7 8 9
+9 7 6 2 1
+1 3 2 4 5
+8 6 4 4 1
+1 3 6 7 9'''
+
+# for each line we want to compare the current number to the next number
+# if the number is between 1 and 3 difference it is valid
+# we also need to know and store if it is ascending or descending
+# because all numbers need to be ascending or descending and not mixed
+# this will mean the line is valid
+
+valid_list_count = 0
+retest_list = []
+
+    
+def test_line(line):
+    safe = False
+
+    # check all numbers in the line are ascending or descending
+    if line == sorted(line) or line == sorted(line, reverse=True):
+        #print(line, 'ascending or descending')
+        safe = True
+        print(line, 'steady')
+    else:
+        safe = False
+        print(line, 'unsteady')
+        #retest_list.append(line)
+        return 0
+
+    for i, num in enumerate(line):
+        if i == 0:
+            continue
+        check = abs(num - line[i-1])
+        if check >= 4 or check == 0:
+            #print(check)
+            safe = False
+        else:
+            #print(check)
+            safe = True
+        if not safe:
+            print(line, 'unsafe, big jumps')
+            #retest_list.append(line)
+            return 0
+    return 1
+
+reports = []
+# convert the input to a list of lists
+for line in input.split('\n'):
+    data = line.split()
+    reads = [int(i) for i in data]
+    reports.append(reads)
+
+#print(reports)
+
+for report in reports:
+    safe = test_line(report)
+    if safe:
+        print(report, 'safe')
+        valid_list_count += 1
+    else:
+        #add the list to the retest list
+        retest_list.append(report)
+
+print(retest_list)
+
+# # we need to iterate over the retest list
+# but this time removing one number and doing the test again, 
+# if it is safe we can add it to our safe count and move on
+# if it is unsafe, we need to add back in our removed number and remove the next number
+for list in retest_list:
+    for i, num in enumerate(list):
+        # remove the number
+        test_list = list.copy()
+        test_list.pop(i)
+        safe = test_line(test_list)
+        if safe:
+            print(test_list, 'safe')
+            valid_list_count += 1
+            break
+
+print(valid_list_count)