Map [jboi 2007]

#include <iostream> //cin, cout
#include <string>   //string
#include <map>      //map
#include <sstream>  //istringstream
#include <cmath>    //sqrt
#include <iomanip>  //setprecision

using namespace std;

class Solution {
private:
    string str;
    map<char, int> dir;
    bool tracking = false;
    int j = 0;
    char cdir = '0';
    float dist;

    bool isint(char &c) {
        return c == '0' || c == '1' || c == '2' || c == '3' || c == '4' || c == '5' || c == '6' || c == '7' || c == '8' || c == '9';
    }
    void add(int i) {
        string num = str.substr(j, i - 1);
        istringstream iss;
        iss.str(num);
        int inum;
        iss >> inum;
        dir[cdir] += inum;
        //cout << "\tinum=" << inum << "; dir[" << cdir << "]=" << dir[cdir] << endl;
    }
public:
    Solution(string strin) : str(strin) {
        //parse the string and get the north, south, west, and east distances
        for (unsigned int i = 0; i < str.length(); ++i) {
            char c = str.at(i);

            //cout << "c=" << c << endl;

            if (tracking && i + 1 == str.length()) {
               add(i);
            }
            if (!isint(c)) {
                if (tracking) {
                    add(i);
                    tracking = false;
                }
                if ((c == 'n' || c == 's' || c == 'w' || c == 'e')) {
                    tracking = true;
                    j = i + 1;
                    cdir = c;
                    //cout << "\tnow tracking; j=" << j << endl;
                }
            }
        }
        //cout << "\tc[n]=" << dir['n'] << "; c[s]=" << dir['s'] << "; c[w]=" << dir['w'] << "; c[e]=" << dir['e'] << endl;

        //calculate the distance using pythagorean theorem
        int v = dir['n'] - dir['s'];
        v = v > 0 ? v : -v;
        int h = dir['w'] - dir['e'];
        h = h > 0 ? h : -h;
        dist = sqrt(v*v + h*h);
    }
    float getDistance() {
        return dist;
    }
};

int main() {
    string str;
    getline(cin, str);

    Solution solution(str);
    float dist = solution.getDistance();
    cout << std::fixed << std::setprecision(2) << dist << endl;

    return 0;
}