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Author: Pankajcoder1

best_approach/power_of_two_no.cpp

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+/*
+	written by Pankaj Kumar.
+	country:-INDIA
+*/
+#include<algorithm>
+#include<string.h>
+#include<iostream>
+#include<vector>
+#include<deque>
+#include<cmath>
+#include<set>
+#include<map>
+using namespace std;
+typedef long long ll ;
+typedef vector<int> vi;
+typedef vector<pair<int,int>> vpi;
+typedef vector<ll> vl;
+typedef vector<pair<ll,ll>> vpl;
+typedef vector<string> vs;
+typedef set<string> ss;
+typedef set<int> si;
+typedef set<ll> sl;
+typedef set<pair<int,int>> spi;
+typedef set<pair<ll,ll>> spl;
+#define pan cin.tie(0);cout.tie(0);ios_base::sync_with_stdio(0);
+// define values.
+#define mod 1000000007;
+#define phi 1.618
+/* Bit-Stuff */
+#define get_set_bits(a) (__builtin_popcount(a))
+#define get_set_bitsll(a) ( __builtin_popcountll(a))
+#define get_trail_zero(a) (__builtin_ctz(a))
+#define get_lead_zero(a) (__builtin_clz(a))
+#define get_parity(a) (__builtin_parity(a))
+/*  Abbrevations  */
+#define ff first
+#define second ss
+#define mp make_pair
+#define line cout<<endl;
+#define pb push_back
+#define INT_SIZE sizeof(int)
+#define INT_BITS INT_SIZE*8-1
+/* ascii value 
+A=65,Z=90,a=97,z=122
+*/
+/*  -----------------------------------------------------------------------------------*/
+
+// time complexity is O(log(n))
+int main()
+{
+	pan;
+	ll a,b,res=1;
+	cout<<"Enter two no : ";
+	cin>>a>>b;
+	while(y>0)
+	{
+		if(y%2==1)
+			res*=x;
+		y=y/2;
+		x=x*x;
+	}
+	cout<<res<<endl;
+}