Лямбда - функции

gistfile1.txt

#include <iostream>
#include <vector>
#include <list>
#include <string>
#include <algorithm>
#include <map>

using namespace std;

int main() {
    list<int> lst = {1, 2, 4, 7, 10, 13};
    vector<int> v = {5, -2, 8, -1, 0, 6};
    vector<string> words = {"meet", "sea", "son", "night"};

    auto evenCount = count_if(lst.begin(), lst.end(),
        [](int x) { return x % 2 == 0; });

    cout << evenCount << endl;

    for_each(v.begin(), v.end(),
        [](int x) {
            if (x % 2 == 0)
                cout << x << " ";
        });
    cout << endl;

    v.erase(remove_if(v.begin(), v.end(),
        [](int x) { return x < 0; }), v.end());

    for (int x : v) cout << x << " ";
    cout << endl;

    char letter = 's';
    auto countByLetter = count_if(words.begin(), words.end(),
        [letter](const string& s) {
            return !s.empty() && s[0] == letter;
        });

    cout << countByLetter << endl;

    map<char, int> result;
    for_each(words.begin(), words.end(),
        [&result](const string& s) {
            if (!s.empty())
                result[s[0]]++;
        });

    for (auto& p : result)
        cout << p.first << " - " << p.second << endl;
}