add stl & more efficient scope

stl/sort.nas

@@ -0,0 +1,27 @@
+# lib sort.nas
+# valkmjolnir 2021/4/2
+var sort=func(vec,left,right,cmp=func(a,b){return a<=b;})
+{
+    if(left>=right) return nil;
+    var L=left;
+    var R=right;
+    var tmp=vec[L];
+    while(left<right)
+    {
+        while(left<right and cmp(tmp,vec[right]))
+            right-=1;
+        while(left<right and cmp(vec[left],tmp))
+            left+=1;
+        if(left!=right)
+        {
+            var t=vec[left];
+            vec[left]=vec[right];
+            vec[right]=t;
+        }
+    }
+    vec[L]=vec[left];
+    vec[left]=tmp;
+    sort(vec,L,left-1,cmp);
+    sort(vec,left+1,R,cmp);
+    return nil;
+}