feat: add two_sum

Author: wislertt

.github/workflows/ci-test-reproducibility.yml

@@ -62,7 +62,7 @@ jobs:
                   fi
 
             - name: Check test case count
-              run: poetry run python .templates/check_test_cases.py --threshold=10
+              run: poetry run python .templates/check_test_cases.py --threshold=5 --max=100
 
             - name: Backup existing problems
               run: |

.templates/check_test_cases.py

@@ -82,7 +82,7 @@ def main(
             typer.echo(f"Invalid max_results value: {max_results}", err=True)
             raise typer.Exit(1)
 
-    typer.echo(f"Files with ≤{threshold} test cases ({len(filtered_files)} total):")
+    typer.echo(f"Problems with ≤{threshold} test cases ({len(filtered_files)} total):")
     for filename, count in filtered_files:
         typer.echo(f"{filename}: {count} test cases")