[蓝桥杯]试题 基础练习 Sine之舞

#include<iostream>
#include<string>
#include<cstdlib>
#include<vector>

using namespace std;

int main()
{
	int n;
	cin>>n;
	/* 测试了可以不写 
	if(n < 1)
	{
		cout<<"";
		return 0;
	}
	*/
	vector<string>An(220,"");
	char intStr[10];
	string ch = "";
	for(int i = n; i >= 1; i--)
	{
		string str = "";
		itoa(i,intStr, 10); 
		ch = string(intStr); 
		str = "sin(" + ch + ")"; 
		for(int j = i-1; j >= 1; j--)
		{
			itoa(j,intStr, 10); 
			ch = string(intStr);
			str = "sin(" + ch + "+"+ str + ")"; 
		}
		//cout<<str<<endl;
		An[i] = str; 
	}
	string res = "";
	itoa(n,intStr, 10); 
	ch = string(intStr); 
	res = An[1] + "+" + ch;
	for(int i = 2; i <= n; i++)
	{
		itoa(n - i + 1,intStr, 10); 
		ch = string(intStr); 
		res = "("+res+")" +An[i] +"+" + ch;  
	}
	cout<<res;
	return 0; 
}