delete pics to save space

2.514.cpp

@@ -0,0 +1,44 @@
+#include<iostream>
+#include<cstdio>
+using namespace std;
+const int maxn=10007;
+int n,k,a[maxn],s[maxn],top,q,x;
+bool f()
+{
+    k=1,top=0;
+    for(int i=1;i<=n;i++)
+    {
+        s[++top]=i;
+        while(top>0&&s[top]==a[k])
+        {
+            k++;
+            top--;
+        }
+    }
+    if(top==0) return 1;
+    else return 0;
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+    while(1)
+    {
+        scanf("%d",&q);
+        if(q==0) break;
+        while(1)
+        {
+            scanf("%d",&x);
+            if(!x) break;
+            else a[1]=x;
+            for(int i=2;i<=q;i++)
+                scanf("%d",&a[i]);
+            n=q;
+            if(f()) printf("Yes\n");
+            else printf("No\n");
+        }
+        printf("\n");
+    }
+    return 0;
+}