题解 | #统计字符串中各字母字符对应的个数#

#include <iostream>
// write your code here......
#include <map>
using namespace std;

int main() {

    char str[100] = { 0 };
    cin.getline(str, sizeof(str));

    // write your code here......
    map<char, int> m;
    for (int i = 0; str[i] != '\0'; i++) {
        if (isalpha(str[i])) {
            // m[str[i]]++;
            auto it = m.find(str[i]);
            if (it != m.end())
                m.insert(pair<char, int>(it->first, it->second++));
            else
                m.insert(pair<char, int>(str[i], 1));
        }
    }
    for (auto it = m.begin(); it != m.end(); it++) {
        cout << it->first << ":" << it->second << endl;
    }

    return 0;
}