//統計字符 #include <vector> #include<iostream> #include<string> #include<cctype> #include <algorithm> using namespace std;int main() {string str;vector<int> v;vector<int>::iterator iter = v.begin();getline(cin, str);int len = str.size(), letter_n = 0, digit_n = 0, space_n = 0;for (int i = 0; i<len; i++){if (isalpha(str[i]))letter_n++;else if (isdigit(str[i]))digit_n++;else if (isspace(str[i]))space_n++;}v.push_back(letter_n);v.push_back(digit_n);v.push_back(space_n);/* for (iter = v.begin(); iter != v.end(); iter++)cout << *iter<<',';cout << endl; */ //普通迭代器輸出sort(v.rbegin(), v.rend(), less<int>());cout << "反向迭代器輸出: " << endl;vector<int>::reverse_iterator it = v.rbegin();while (it != v.rend()){cout << *it << " ";++it;}return 0; }

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