From 1372178916d45a367a88740a564d17d98c455c92 Mon Sep 17 00:00:00 2001
From: Baoshuo <i@baoshuo.ren>
Date: Thu, 21 Apr 2022 19:23:01 +0800
Subject: [PATCH] =?UTF-8?q?876.=20=E5=BF=AB=E9=80=9F=E5=B9=82=E6=B1=82?=
 =?UTF-8?q?=E9=80=86=E5=85=83?=
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https://www.acwing.com/problem/content/submission/code_detail/13591616/
---
 AcWing/876/876.cpp | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 AcWing/876/876.cpp

diff --git a/AcWing/876/876.cpp b/AcWing/876/876.cpp
new file mode 100644
index 00000000..bebf14c9
--- /dev/null
+++ b/AcWing/876/876.cpp
@@ -0,0 +1,35 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+int n, a, p;
+
+long long binpow(int a, int b, int m) {
+    long long res = 1;
+    a %= m;
+    while (b) {
+        if (b & 1) res = res * a % m;
+        a = 1ll * a * a % m;
+        b >>= 1;
+    }
+    return res;
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+
+    cin >> n;
+
+    while (n--) {
+        cin >> a >> p;
+        if (a % p) {
+            cout << binpow(a, p - 2, p) << endl;
+        } else {
+            cout << "impossible" << endl;
+        }
+    }
+
+    return 0;
+}