https://www.nowcoder.com/practice/8ef655edf42d4e08b44be4d777edbf43?tpId=37&&tqId=21276&rp=1&ru=/activity/oj&qru=/ta/huawei/question-ranking

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

int main()
{
    int n=0;

    while(cin>>n)
    {
        int resultNum=-1;
        int arr[]={4, 2, 3, 2};
        if(n>2)
        {
            resultNum = arr[(n-2)%4];
        }
        
        cout<<resultNum<<endl;
    }

    return 0;
}

https://www.nowcoder.com/questionTerminal/a35ce98431874e3a820dbe4b2d0508b1

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

int main()
{
    string s;
    char ch;
    getline(cin, s);
    ch = getchar();
    if('a'<=ch && ch<='z')
    {
        ch-=32;
    }
    int count=0;
    for(auto c:s) 
    {
        if('a'<=c && c<='z')
        {
            c-=32;
        }

        if(c==ch)
        {
            ++count;
        }
    }

    cout<<count<<endl;
    return 0;
}