删除字符串中最少字符

#include <iostream>
#include <string>
#include <vector>
using namespace std;


int main()
{
	string str;
	cin>>str;
	int ch[27] ;
	memset(ch , 0, sizeof(int)*27);
	for(size_t i  = 0; i < str.length(); ++i)
	{
		ch[str[i] - 'a'] ++;
	}
	int min = str.length();
	for(int i = 0; i < 26; ++i)
	{
		if(ch[i] < min && 0 != ch[i])
		{
			min = ch[i];
		}
	}

	vector<char> vec;
	for(int i = 0; i < str.length(); ++i)
	{
		if(ch[str[i] - 'a'] != min)
		{
			vec.push_back(str[i]);
		}

	}
	for(int i =0; i < vec.size(); ++i)
	{
		cout<<vec[i];
	}
	cout<<endl;
	
	return 0;
}