NextString.cpp

#include <iostream>
#include <string>
#include <vector>
#include <stack>
#include <sstream>
#include <utility>
#include <set>
using namespace std;

vector<int> cnt;
vector<int> arr;

vector<string> parse(vector<char> &sepArr, char esc, string &s) {
  set<char> sep;
  for (int i = 0; i < sepArr.size(); i++) {
    sep.insert(sepArr[i]);
  }
  vector<string> result;
  // assume valid input
  string tmp;
  for (int i = 0; i < s.size(); ) {
    if (sep.find(s[i]) != sep.end()) {
      result.push_back(tmp);
      tmp = "";
      i++;
    } else if (s[i] == esc) {
      tmp += s[i+1];
      i += 2;
    } else {
      tmp += s[i];
      i++;
    }
  }
  result.push_back(tmp);
  return result;
}

// "a,a"
// "a,"
// ",a"
// ","
// ",,"
// "a\,a,a"
// "a,|a"
bool test(string &s) {
  vector<char> sep;
  sep.push_back(',');
  sep.push_back('|');
  char esc = '\\';
  vector<string> vec = parse(sep, esc, s);
  cout << vec.size() << " : ";
  for (int i = 0; i < vec.size(); i++) {
    cout << '"' << vec[i] << '"';
    if (i != vec.size() - 1) {
      cout << " , ";
    } else {
      cout << endl;
    }
  }
}

int main() {
  while (true) {
    string s;
    cin >> s;
    test(s);
  }
  return 0;
}