delete pics to save space

1.3369.cpp

@@ -0,0 +1,76 @@
+#include<cstdio>
+#include<cstdlib>
+#include<ctime>
+const int maxn=100005;
+int n,rt,x,y,z,op,a,ch[maxn][2],val[maxn],rd[maxn],sz[maxn],cnt;
+inline void PushUp(int x) { sz[x]=sz[ch[x][0]]+1+sz[ch[x][1]]; }
+inline int NewNode(int v) { val[++cnt]=v; sz[cnt]=1; rd[cnt]=rand(); return cnt; }
+int merge(int x,int y)
+{
+	if(!x||!y) return x+y;
+	if(rd[x]<rd[y]) { ch[x][1]=merge(ch[x][1],y); PushUp(x); return x; }
+	else { ch[y][0]=merge(x,ch[y][0]); PushUp(y); return y; }
+}
+void split(int o,int v,int &x,int &y)
+{
+	if(!o) x=y=0;
+	else
+	{
+		if(val[o]<=v) { x=o; split(ch[o][1],v,ch[o][1],y); }
+		else { y=o; split(ch[o][0],v,x,ch[o][0]); }
+		PushUp(o);
+	}
+}
+inline int kth(int o,int k)
+{
+	while(true)
+	{
+		if(k<=sz[ch[o][0]]) o=ch[o][0];
+		else if(k==sz[ch[o][0]]+1) return o;
+		else { k-=sz[ch[o][0]]+1; o=ch[o][1]; }
+	}
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	srand(1022);
+	scanf("%d",&n);
+	for(int i=1;i<=n;i++)
+	{
+		scanf("%d%d",&op,&a);
+		if(op==1)
+		{
+			split(rt,a,x,y);
+			rt=merge(merge(x,NewNode(a)),y);
+		}
+		else if(op==2)
+		{
+			split(rt,a,x,z);
+			split(x,a-1,x,y);
+			y=merge(ch[y][0],ch[y][1]);
+			rt=merge(merge(x,y),z);
+		}
+		else if(op==3)
+		{
+			split(rt,a-1,x,y);
+			printf("%d\n",sz[x]+1);
+			rt=merge(x,y);
+		}
+		else if(op==4) printf("%d\n",val[kth(rt,a)]);
+		else if(op==5)
+		{
+			split(rt,a-1,x,y);
+			printf("%d\n",val[kth(x,sz[x])]);
+			rt=merge(x,y);
+		}
+		else if(op==6)
+		{
+			split(rt,a,x,y);
+			printf("%d\n",val[kth(y,1)]);
+			rt=merge(x,y);
+		}
+	}
+	return 0;
+}