计数数组之统计字符频率

Question

题目样例如图：.
写了一个小时还是有输出重复的难受死了1233463
求解答

Answer 1

#include<iostream>  
#include <unordered_map>
#include <algorithm>
#pragma warning(disable:4996)
using namespace std;
int main()
{
        unordered_map<char,int> data;
        string str="Code1019.cpp";
        for (char c : str) {
                data[c]++;
        }                                                                    
        vector<pair<char,int>> vecdata;
                for (auto& p : data) {
                vecdata.push_back(p);
        }
        sort(vecdata.begin(),vecdata.end(),[=](auto p1,auto p2){
                return p1.first>p2.first;
        });
        for (auto& p : vecdata)
        {
                cout<<p.first<<":"<<p.second<<" ";
        }
}