'commit'

C++课程/第十四课位运算训练精讲/快速幂.cpp

@@ -0,0 +1,29 @@
+#include<iostream>
+#include <bitset>
+using namespace std;
+
+//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+void printEr(int b) {
+	cout<<bitset<sizeof(b)*2>(b)<<endl;
+}
+//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+int poww(int a, int b) {
+	int ans = 1, base = a;
+	while (b >0) {
+		//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƶ<EFBFBD>b
+		printEr(b);
+		//<2F><><EFBFBD><EFBFBD><EFBFBD>ݵĺ<DDB5><C4BA><EFBFBD><EFBFBD>㷨
+		if (b & 1)  //<2F><><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD> & 1 <20>Ľ<EFBFBD><C4BD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD>Ƶ<EFBFBD><C6B5><EFBFBD>ĩλ<C4A9><CEBB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һλ<D2BB><CEBB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>1<EFBFBD><31><EFBFBD><EFBFBD>ʾ<EFBFBD><CABE><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><D2AA><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB>
+			ans *= base;
+		base *= base;
+		//<2F><><EFBFBD><EFBFBD>һλ<D2BB><CEBB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD>2
+		b >>= 1;
+	}
+	return ans;
+}
+
+int main() {
+	cout << poww(2,5);
+
+	return 0;
+}