华为oj之字符个数统计

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#include <cstdio>
#include <iostream>
#include <unordered_map>
#include <string>
using namespace std;

int main()
{
    string str;
    getline(cin,str);
    unordered_map<char, int> countMap;
    
    int diffCh = 0;
    for(int i=0; i <= str.length()-1; i++)
    {   
        if( (int)str[i]>=0 && (int)str[i]<=127)
        {
            if(countMap.find(str[i]) == countMap.end())
            {
                countMap[str[i]] = 1;
            }
            else
            {
                countMap[str[i]]++;
            }            
        }
    }
     for(int i=0; i <= countMap.size()-1; i++)
     {
         if(countMap[str[i]] >= 1)
         {
             diffCh++;
         }
     }
    cout<<countMap.size()<<endl;
    return 0;
}

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#include<iostream>
#include<set>
using namespace std;
int main()
{
    char ch;
    set<char> s;
    while(cin>>ch){
        if(ch>=0 && ch<=127){
            s.insert(ch);
        }
    }
    cout << s.size()<<endl;
}