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Luogu/P_10446_64_位整数乘法.cpp

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+#include <bits/stdc++.h>
+#define lo long long
+#define IMX LONG_LONG_MAX
+#define IMN LONG_LONG_MIN
+
+using namespace std;
+const int N = 1e7 + 10;
+/*
+    toothless. #17
+    @fredcss_dev
+*/
+
+lo qpow(lo a, lo b, lo p) {
+    lo result = 0;
+    while (b) {
+        if (b & 1) {
+            result += a;
+            result %= p;
+        }
+        b >>= 1;
+        a += a;
+        a %= p;
+    }
+    return result;
+}
+
+lo a, b, p; 
+
+signed main()
+{
+	cin >> a >> b >> p;
+	cout << qpow(a, b, p);
+    return 0;
+}