题解 | #字符统计#
字符统计
https://www.nowcoder.com/practice/c1f9561de1e240099bdb904765da9ad0
打卡
#include <string>
#include <algorithm>
#include <map>
using namespace std;
int main() {
int num[10] = { 0 }, abc[26] = { 0 };
string s;
map<int, string>ans;
cin >> s;
for (char c : s) {
if (c >= '0' && c <= '9') num[c - '0']++;
else abc[c - 'a']++;
}
for (int i = 0; i < 10; i++)
if (num[i] != 0)
ans[num[i]] += '0' + i;
for (int i = 0; i < 26; i++)
if (abc[i] != 0)
ans[abc[i]] += 'a' + i;
for (auto i = ans.rbegin(); i != ans.rend(); i++)
cout << i->second;
}