[backend]将testdata/下的测例替换为了赛方测试用例，更新了测试脚本

testdata/h_functional/21_union_find.sy

@@ -0,0 +1,47 @@
+const int maxN = 1005;
+int parent[maxN];
+
+int find(int root) {
+  if (parent[root] == root)
+    return root;
+  else {
+    parent[root] = find(parent[root]);
+    return parent[root];
+  }
+}
+
+void merge(int p, int q) {
+  int root_p, root_q;
+  root_p = find(p);
+  root_q = find(q);
+  if (root_p != root_q) {
+    parent[root_q] = root_p;
+  }
+  return;
+}
+
+int main() {
+  int n = getint(), m = getint(), i;
+  int p, q;
+  i = 0;
+  while (i < n) {
+    parent[i] = i;
+    i = i + 1;
+  }
+  i = 0;
+  while (i < m) {
+    p = getint();
+    q = getint();
+    merge(p, q);
+    i = i + 1;
+  }
+
+  int clusters = 0;
+  i = 0;
+  while (i < n) {
+    if (parent[i] == i) clusters = clusters + 1;
+    i = i + 1;
+  }
+  putint(clusters);
+  return 0;
+}