delete pics to save space

p.HDOJ4699.cpp

@@ -0,0 +1,37 @@
+//http://acm.hdu.edu.cn/showproblem.php?pid=4699
+#include<cstdio>
+#include<algorithm>
+using namespace std;
+const int maxn=1e6+5;
+int stka[maxn],stkb[maxn],la,lb,Q,s[maxn],f[maxn];
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	f[0]=-0x3f3f3f3f;
+	while(scanf("%d",&Q)==1)
+	{
+		la=lb=0;
+		while(Q-->0)
+		{
+			char a[2]; int b; scanf("%s",a);
+			if(a[0]=='I')
+			{
+				scanf("%d",&stka[++la]);
+				s[la]=s[la-1]+stka[la];
+				f[la]=max(f[la-1],s[la]);
+			}
+			else if(a[0]=='D'&&la) la--;
+			else if(a[0]=='L'&&la) stkb[++lb]=stka[la--];
+			else if(a[0]=='R'&&lb)
+			{
+				stka[++la]=stkb[lb--];
+				s[la]=s[la-1]+stka[la];
+				f[la]=max(f[la-1],s[la]);
+			}
+			else if(a[0]=='Q') { scanf("%d",&b); printf("%d\n",f[b]); }
+		}
+	}
+	return 0;
+}