题解 | #计算某字符出现次数#

#include <cctype>
#include <cstddef>
#include <iostream>
#include <bits/stdc++.h>
#include <string>
#include <unordered_map>
using namespace std;

int main() {
    string s;
    getline(cin, s);
    char c;
    cin>>c;
    unordered_map<char,size_t>mp;
    for(auto i:s){
        ++mp[tolower(i)];
    }
    cout<<mp[tolower(c)];

}
// 64 位输出请用 printf("%lld")