89. a^b

https://www.acwing.com/problem/content/submission/code_detail/8019425/

AcWing/89/89.cpp

@@ -0,0 +1,17 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+long long a, b, p, ans = 1;
+
+int main() {
+    cin >> a >> b >> p;
+    a %= p;
+    while (b) {
+        if (b & 1) ans = ans * a % p;
+        a = a * a % p;
+        b >>= 1;
+    }
+    cout << ans % p << endl;
+    return 0;
+}