add test data

test/testcases/io.inc

@@ -0,0 +1,14 @@
+int judgeResult = 0;
+const int Mod = 253;
+
+void printInt(int x) {
+  judgeResult ^= x;
+  judgeResult += 173;
+}
+
+void printStr(const char *str) {
+  for (const char *cur = str; *cur != 0; ++cur) {
+    judgeResult ^= *cur;
+    judgeResult += 521;
+  }
+}