diff --git a/Codeforces/706D_standard.cpp b/Codeforces/706D_standard.cpp
new file mode 100644
index 0000000..19b19c1
--- /dev/null
+++ b/Codeforces/706D_standard.cpp
@@ -0,0 +1,129 @@
+#include <iostream>
+#include <string>
+#include <vector>
+#include <algorithm>
+#include <stdio.h>
+
+using namespace std;
+
+int q;
+int sz = 1;
+struct node
+{
+	int zero;
+	int one;
+	int cnt1;
+	int cnt0;
+}a[10000000];
+
+int main()
+{
+	cin >> q;
+	for (int i = 0; i <= q; i++)
+	{
+		char c;
+		int x;
+		if(i==0)
+		{
+		    c='+';
+		    x=0;
+		}
+		else
+		cin >> c >> x;
+		if (c == '+')
+		{
+			int bit[32];
+			for (int i = 0; i < 32; i++)
+			{
+				bit[i] = x % 2;
+				x /= 2;
+			}
+			int v = 1;
+			for (int i = 31; i >= 0; i--)
+			{
+				if (bit[i] == 1)
+				{
+					a[v].cnt1++;
+					if (a[v].one == 0)
+					{
+						sz++;
+						a[v].one = sz;
+					}
+					v = a[v].one;
+				}
+				else
+				{
+					a[v].cnt0++;
+					if (a[v].zero == 0)
+					{
+						sz++;
+						a[v].zero = sz;
+					}
+					v = a[v].zero;
+				}
+			}
+		}
+		if (c == '-')
+		{
+			int bit[32];
+			for (int i = 0; i < 32; i++)
+			{
+				bit[i] = x % 2;
+				x /= 2;
+			}
+			int v = 1;
+			for (int i = 31; i >= 0; i--)
+			{
+				if (bit[i] == 1)
+				{
+					a[v].cnt1--;
+					v = a[v].one;
+				}
+				else
+				{
+					a[v].cnt0--;
+					v = a[v].zero;
+				}
+			}
+		}
+		if (c == '?')
+		{
+			int ans = 0;
+			int bit[32];
+			for (int i = 0; i < 32; i++)
+			{
+				bit[i] = x % 2;
+				x /= 2;
+			}
+			int v = 1;
+			for (int i = 31; i >= 0; i--)
+			{
+				if (bit[i] == 1)
+				{
+					if (a[v].cnt0 > 0)
+					{
+						ans += (1 << i);
+						v = a[v].zero;
+					}
+					else
+					{
+						v = a[v].one;
+					}
+				}
+				else
+				{
+					if (a[v].cnt1 > 0)
+					{
+						ans += (1 << i);
+						v = a[v].one;
+					}
+					else
+					{
+						v = a[v].zero;
+					}
+				}
+			}
+			cout << ans << endl;
+		}
+	}
+}