学步园

给定一个数，如何用平衡三进制表示，就像5= 9-3-1？

有时候，觉得平衡三进制很有用处，既有加法，也有减法。

#include <iostream>

using namespace std;

void transform_ternary3 (int num){
	int m = 0;
	vector<int> seri;

	if (!num){
		cout << 0 <<endl;
		return;
	}
    int flag = 1;
	if (num <0){
		num = -num;
		flag = -1;
	}

	int s= 1;
	int t = 1;
	int n = 0;

	while(num){
		m = num % 3;

		if (m == 2){
			num = num + 1;
			m = -1;
		}

		t = m * s * flag;
		if (t >0){
			if (!n)
				cout <<t;
			else
				cout <<"+"<<t;
			n=1;
		}
		else if (t <0){
			cout << t;
			n = 1;
		}		
		num = num / 3;
		s *=3;
	}
		
	cout << endl;

}
int main(){
    
	int num ;
	for ( int i = 0 ;i < 20;i++){
		cout << i <<"= ";
		transform_ternary3(i);
		cout <<-i <<"= ";
		transform_ternary3(-i);
	}
	
	system("pause()");
}