题解 | #计算某字符出现次数#

#include <iostream>
#include <string>
#include <unordered_map>

using namespace std;

int main(int, char **)
{
    unordered_map<char, int> map;
    string input;//带空格的输入字符串
    getline(cin,input);//getline可以带空格
    char target;
    cin >> target;
    for (auto i : input) {
        ++map[tolower(i)];
    }
    cout << map[tolower(target)] << endl;
}