题解 | 计算某字符出现次数

#include <iostream>
#include <cctype> 
#include <string>
#include<vector>
using namespace std;

int main() {
    string str;
    char ch;
    getline(cin, str);
    cin>>ch;
    int sum = 0;
    vector<string> list;
    for (int i= 0; i < str.size(); i+=1) {
        if (tolower(ch) == tolower(str[i])) {
            sum += 1;
        }
    }
    cout<<sum<<endl;
}
// 64 位输出请用 printf("%lld")