Initiate Luogu

Luogu/P1010 [NOIP1998 普及组] 幂次方.cpp

@@ -0,0 +1,51 @@
+#include <iostream>
+#include <cmath>
+#include <cstring>
+#include <string>
+#include <algorithm>
+using namespace std;
+string flag(int in){
+	if(in==15)	return "2(2+2(0))+2(2)+2+2(0)";
+	else if(in==14)	return "2(2+2(0))+2(2)+2";
+	else if(in==13)	return "2(2+2(0))+2(2)+2(0)";
+	else if(in==12)	return "2(2+2(0))+2(2)";
+	else if(in==11)	return "2(2+2(0))+2+2(0)";
+	else if(in==10)	return "2(2+2(0))+2";
+	else if(in==9)	return "2(2+2(0))+2(0)";
+	else if(in==8)	return "2(2+2(0))";
+	else if(in==7)	return "2(2)+2+2(0)";
+	else if(in==6)	return "2(2)+2";
+	else if(in==5)	return "2(2)+2(0)";
+	else if(in==4)	return "2(2)";
+	else if(in==3)	return "2+2(0)";
+	else if(in==2)	return "2";
+	else return "";
+}
+int main(){
+	int n;
+	cin>>n;
+	int a[16]={0},b[16]={-1},c[16]={-1},d[16]={-1};
+	for(int j=0;j<16;j++){
+		a[j]=pow(2,j);
+	}
+	int tmp=n;
+	int i=15,js=0;
+	while(tmp!=0){
+		if(tmp>=a[i]){
+			tmp-=a[i];
+			b[js]=i;
+			js++;
+		}
+		i--;
+	}
+	for(int j=0;j<js;j++){
+		if(b[j]!=0&&b[j]!=1)	cout<<"2("<<flag(b[j])<<")";
+		if(b[j]==1)	cout<<"2";
+		if(b[j]==0)	cout<<"2(0)";
+		if(j!=(js-1)){
+			cout<<"+";	
+		}
+	}
+	
+	return 0;
+}