题解 | #计算某字符出现次数#

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

int main() {
    string a;
    char b, c = 0;
    getline(cin, a);
    cin>>b;
    if(b>='a'&&b<='z'||b>='A'&&b<='Z')
        c = b>='a'?b-32:b+32;
    int ans=0;
    for(int i=0; i<a.size(); i++){
        if(a[i]==b||a[i]==c)
            ans+=1;
    }
    cout<<ans;
}