#include <bits/stdc++.h>

using namespace std;

using Coords = pair<int, int>;

void moveTail(const Coords& head, Coords& tail){
    if(head.first - tail.first > 1){
        tail.first++;
    } else if(head.first - tail.first < -1){
        tail.first--;
    }

    if(head.second - tail.second > 1){
        tail.second++;
    } else if(head.second - tail.second < -1){
        tail.second--;
    }
    // if(abs(head.first - tail.first) > 1 || abs(head.second - tail.second) > 1){
    //     if(abs(head.first - tail.first) >= 1 && abs(head.second - tail.second) >= 1){
    //         if(head.first > tail.first && head.second > tail.second){
    //             tail.first++;
    //             tail.second++;
    //         } else if(head.first > tail.first && head.second < tail.second){
    //             tail.first++;
    //             tail.second--;
    //         } else if(head.first < tail.first && head.second > tail.second){
    //             tail.first--;
    //             tail.second++;
    //         } else{
    //             tail.first--;
    //             tail.second--;
    //         }
    //     } else if(abs(head.first - tail.first > 1)){
    //         if(head.first > tail.first){
    //             tail.first++;
    //         } else{
    //             tail.first--;
    //         }
    //     } else{
    //         if(head.second > tail.second){
    //             tail.second++;
    //         } else{
    //             tail.second--;
    //         }
    //     }
    // }
}

int main(){
    ifstream input_file("test.txt");
    string line;

    Coords head(0, 0), tail(0, 0);
    set<Coords> visited_by_tail;
    visited_by_tail.insert(tail);

    while(getline(input_file, line)){
        stringstream ss(line);
        char direction;
        int steps;

        ss >> direction >> steps;

        while(steps > 0){
            if(direction == 'R'){
                head.first++;
            } else if(direction == 'L'){
                head.first--;
            } else if(direction == 'U'){
                head.second++;
            } else if(direction == 'D'){
                head.second--;
            }
            moveTail(head, tail);
            visited_by_tail.insert(tail);
            steps--;
        }
    }

    cout << "Number of positions visited by the tail: " << visited_by_tail.size() << endl;

    return 0;
}