diff --git a/src/8/20/P2312.cpp b/src/8/20/P2312.cpp
new file mode 100644
index 0000000..aa14d40
--- /dev/null
+++ b/src/8/20/P2312.cpp
@@ -0,0 +1,88 @@
+#include <cctype>
+#include <iostream>
+#include <string>
+#include <vector>
+
+using i128 = __int128_t;
+using ll = int64_t;
+
+ll n, m;
+const std::vector<ll> mods = {(ll)1e9+7};
+std::vector<std::vector<ll>> a;
+
+ll strp(const std::string &s, ll p) {
+    ll num = 0;
+    int idx = 0;
+    ll nag = 1;
+    if (s[0] == '-') {
+        nag = -1;
+        idx = 1;
+    }
+    for (size_t i = idx; i < s.length(); ++i) {
+        num = (num * 10 + (s[i] - '0')) % p;
+    }
+    num = (num * nag) % p;
+    if (num < 0) {
+        num += p;
+    }
+    return num;
+}
+
+int main() {
+
+    std::ios_base::sync_with_stdio(false);
+    std::cin.tie(NULL);
+
+    std::cin >> n >> m;
+    a.resize(n + 1, std::vector<ll>(mods.size()));
+    for (int i = 0; i <= n; ++i) {
+        std::string tmpstr;
+        std::cin >> tmpstr;
+        for (size_t k = 0; k < mods.size(); ++k) {
+            a[i][k] = strp(tmpstr, mods[k]);
+        }
+    }
+
+    std::vector<ll> sol;
+    sol.reserve(100);
+
+    for (ll i = 1; i <= m; ++i) {
+        bool isok = true;
+        for (size_t k = 0; k < mods.size(); ++k) {
+
+            const ll p = mods[k];
+            const auto &cur = a;
+
+            ll curx = 1;
+            i128 sum = 0;
+
+            for (int j = 0; j <= n; ++j) {
+
+                sum += (i128)cur[j][k] * curx;
+                curx = (curx * i) % p;
+
+                if ((j & 15) == 15) {
+                    sum %= p;
+                }
+            }
+
+            sum %= p;
+
+            if (sum != 0) {
+                isok = false;
+                break;
+            }
+        }
+
+        if (isok) {
+            sol.push_back(i);
+        }
+    }
+
+    std::cout << sol.size() << '\n';
+    for (ll ans : sol) {
+        std::cout << ans << '\n';
+    }
+
+    return 0;
+}