题解 | #计算某字符出现次数#

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

int getid(char c)
{   
    int id=0;
    if(c-'a'>=0 && 'z'-c>=0)id=c-'a';
    else if(c-'A'>=0 && 'Z'-c>=0)id=c-'A';
    else if(c-'0'>=0 && '9'-c>=0)id=c-'0'+26;
    else id=36;
    return id;
}

int main() {
    string s;
    int cnt[36]={0};
    char p;
    getline(cin,s);
    cin>>p;
    cin>>p;
    cin>>s>>p;
    for(int i=0;i<s.length();i++){
        int id=getid(s[i]);
        cnt[id]++;
    }
    cout<<cnt[getid(p)];

    return 0;
    
}
// 64 位输出请用 printf("%lld")