计算字符个数

C++

#include <iostream>
#include <vector>
using namespace std;
int main()
{
    string input;
    char target;
    while(cin >> input >> target) {
        vector<int> v(128,0);
        for(int i = 0; i < input.size(); i++) {
            v[input[i]] += 1;
        }
        if(target >= 'a' && target <= 'z')
            cout << v[target]+v[target-32] << endl;
        else if(target >= 'A' && target <= 'Z')
            cout << v[target]+v[target+32] << endl;
        else
            cout << v[target]<< endl;
    }
    return 0;
}