map统计单词个数

用map统计字符串中每个字符出现的次数

#include <iostream>
#include <vector>
#include <string>
#include <map>
#include <algorithm>

using namespace std;

// map统计字符出现的次数
int main(int argc, char **argv)
{
    string str = "slskdflsafd";
    map<char, int>map1;
    for(int i = 0; i < str.size(); i++)
    {
        map1[str[i]]++;
    }
    for(auto it = map1.begin(); it != map1.end(); it++)
    {
        cout << it->first <<":"<<it->second << endl;
    }
    return 0;
}

 

统计单词出现的个数

#include <iostream>
#include <vector>
#include <string>
#include <map>
#include <algorithm>

int main(int argc, char **argv)
{
    vector<string> vec(0);
    int N;
    cout << "输入单词个数：";
    cin >> N;
    cout << "输入单词：" << endl;
    while(N--)
    {
        string str;
        cin >> str;
        vec.push_back(str);
    }
    map<string, int>map1;
    for(int i = 0; i < vec.size(); i++)
    {
        map1[vec[i]]++;
    }
    for(auto it = map1.begin(); it != map1.end(); it++)
    {
        cout << it->first <<":"<<it->second << endl;
    }
    return 0;
}