题解 | #统计字符#

#include<bits/stdc++.h>
#include <unordered_map>
using namespace std;

//统计字符串中指定字符出现的次数
int count(char c, string str2) {
    int sum = 0;
    for (char s : str2) {
        if (s == c) {
            sum++;
        }
    }
    return sum;
}

int main() {
    string str1, str2;
    while (getline(cin, str1)) {
        //str1为"#"时循环结束
        if (str1 == "#") {
            break;
        } else {
            getline(cin, str2);
            //遍历字符串1，统计字符串2中某字符出现的次数并输出
            for (char c :str1) { 
                cout << c << " " << count(c, str2) << endl;
            }
        }
    }
}