Added python script for test input generation and shell script for running

.gitignore

@@ -2,3 +2,4 @@ a.out
 main
 .vscode
 vgcore*
+output.txt

input.py

@@ -0,0 +1,11 @@
+import sys
+
+try:
+  n = int(sys.argv[1])
+except:
+  n = 5
+
+print(n)
+
+for i in range(n):
+  print(i, -i if i % 2 == 0 else i)

run.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+gcc main.c
+python input.py $1 | tee /dev/fd/2 | ./a.out | tee output.txt