diff --git a/problem/P1206/P1206.cpp b/problem/P1206/P1206.cpp
new file mode 100644
index 00000000..12daf4c1
--- /dev/null
+++ b/problem/P1206/P1206.cpp
@@ -0,0 +1,66 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+class node {
+  private:
+    char c(int x) {
+        if (0 <= x && x <= 9) {
+            return x + '0';
+        }
+        return x - 10 + 'A';
+    }
+    int len;
+    int nums[20];
+
+  public:
+    node() {
+        len = 0;
+    }
+    node(int x, int b) {
+        len = 0;
+        while (x) {
+            nums[len] = x % b;
+            x /= b;
+            len++;
+        }
+    }
+
+    int& operator[](int x) {
+        return nums[x];
+    }
+
+    const char* c_str() {
+        string s;
+        for (int i = len - 1; i >= 0; i--) {
+            s.push_back(c(nums[i]));
+        }
+        return s.c_str();
+    }
+    string print() {
+        for (int i = len - 1; i >= 0; i--) {
+            cout << c(nums[i]);
+        }
+        return "";
+    }
+    bool check() {
+        for (int i = 0; i < len; i++) {
+            if (nums[i] != nums[len - i - 1]) {
+                return false;
+            }
+        }
+        return true;
+    }
+};
+
+int main() {
+    int b;
+    cin >> b;
+    for (int i = 1; i <= 300; i++) {
+        node t = node(i * i, b);
+        if (t.check()) {
+            cout << node(i, b).print() << ' ' << t.print() << endl;
+        }
+    }
+    return 0;
+}
diff --git a/problem/P1206/data/P1206_1.in b/problem/P1206/data/P1206_1.in
new file mode 100644
index 00000000..adccc0fc
--- /dev/null
+++ b/problem/P1206/data/P1206_1.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:4a44dc15364204a80fe80e9039455cc1608281820fe2b24f1e5233ade6af1dd5
+size 2
diff --git a/problem/P1206/data/P1206_1.out b/problem/P1206/data/P1206_1.out
new file mode 100644
index 00000000..b9e227c9
--- /dev/null
+++ b/problem/P1206/data/P1206_1.out
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:88a4505153f131552de3d45243b18c66b18bf159dbf6a22f6ebaf92a3305f2d2
+size 93