add test files

test/leetcode1319.nas

@@ -0,0 +1,32 @@
+import("lib.nas");
+# 并查集
+var n=4;
+var input=[[0,1],[0,2],[1,2]];
+
+var find_root=func(x,parent)
+{
+    while(parent[x]!=nil)
+        x=parent[x];
+    return x;
+}
+var union_root=func(x,y,parent)
+{
+    var x_root=find_root(x,parent);
+    var y_root=find_root(y,parent);
+    if(x_root==y_root) return 0;
+    else parent[x_root]=y_root;
+    return 1;
+}
+var makeConnect=func(n,connections)
+{
+    if(size(connections)<n-1) return -1;
+    var cnt=n-1;
+    var parent=[];
+    setsize(parent,n);
+    for(var i=0;i<size(connections);i+=1)
+        if(union_root(connections[i][0],connections[i][1],parent))
+            cnt-=1;
+    return cnt;
+}
+
+print(makeConnect(n,input));