（1）删除字符出现最少的

#include "stdafx.h"#include <iostream>#include <string>using namespace std;int main(){string s;cin>>s;int len=s.length();int a[256]={0};int c[100],j=0;for (int i=0;i<len;i++){a[s[i]]++;}int min=1;for (int i=0;i<256;i++){if (a[i]>=1&&a[i]<=min){min=a[i];}}  for (int j=0;j<len;j++)   {   if (a[s[j]]!=min)  {  cout<<s[j];  }}cout<<endl;return 0;}