Avoid confliction on temporary file names

kwmr_solver.py

@@ -2,6 +2,7 @@ import argparse
 import os
 import random
 import subprocess
+import uuid
 
 proc = None
 stop_flag = False
@@ -28,7 +29,8 @@ def solve(params):
 
     basedir = os.path.abspath(os.path.dirname(__file__))
 
-    solution_filepath = f'{basedir}/a.txt'
+    aid = str(uuid.uuid4())
+    solution_filepath = f'{basedir}/A{aid}.txt'
     if os.path.exists(solution_filepath):
         os.remove(solution_filepath)