Coursera

#include <iostream>
#include <string>
#include <vector>

using namespace std;

vector<vector<string>> months, tasks;
vector<int> days = { 31,28,31,30,31,30,31,31,30,31,30,31 };
int checkMonths = 0;

void add(string name, int day) {
    months[day-1].push_back(name);
}

void dump(int day) {
    tasks.resize(tasks.size() + 1);
    if (months[day - 1].size() != 0) {
        for (int i = 0; i < months[day - 1].size(); i++) {
            tasks.back().push_back(months[day - 1][i]);
        }
    }
}

void next() {
    checkMonths++;
    if (checkMonths > 11) checkMonths = 0;

    vector<vector<string>> nextMonth;
    nextMonth.resize(days[checkMonths]);

    for (int i = 0; i < months.size(); i++) {
        if (months[i].size() != 0) {
            if (i > nextMonth.size()) {
                for (auto x : months[i]) nextMonth[nextMonth.size()-1].push_back(x);
            }
            else {
                for (auto x : months[i]) nextMonth[i].push_back(x);
            }
        }
    }

    months = nextMonth;
}

int main()
{
    int q;
    cin >> q;

    months.resize(days[checkMonths]);

    int day;
    string name, command;
    vector<int> dumps;

    for (int i = 0; i < q; i++) {

        cin >> command;

        if (command == "ADD") {
            cin >> day >> name;

            add(name, day);

        }
        else if (command == "DUMP") {
            cin >> day;

            dump(day);

        }
        else if (command == "NEXT") {
            next();
        }
    }

    for (int i = 0; i < tasks.size(); i++) {
        cout << tasks[i].size();
        if (tasks[i].size() != 0) {
            for (int j = 0; j < tasks[i].size(); j++) {
                cout << " " << tasks[i][j];
            }
        }
        cout << endl;
    }

    system("PAUSE");
}