Substring with Concatenation of All Words

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <sys/wait.h>
#include <limits.h>
#include <time.h>
#include <pthread.h>
#include <string.h>
#include <iostream>
#include <vector>
#include <queue>
#include <sstream>
#include <iterator>
#include <algorithm>
#include <thread>
using namespace std;
vector<int> &findSubstring(const string &s, vector<string>&words) 
{
  int i;
  string line;
  static vector<int>indices;
  vector<int>tmpvec;

indices.clear();
  if(s.empty()) 
  {
    cerr << "s is none...!" << endl;
    return indices;
  }
  int size = words.size();
  if(!size) 
  {
    cerr << "words is none...!" << endl;
    return indices;
  }
  tmpvec.resize(size);
  for(i = 0;i < size;i++) tmpvec[i] = i;
  do
  {
    // join the words to line
    line.clear();
    for(i = 0;i < size;i++)
    {
      int index = tmpvec[i];
      line += words[index];
    }
    // find line in the s
    {
    int pos = s.find(line, 0);
    if(pos == string::npos) continue;
    int len = line.size();
    do
    {
      indices.push_back(pos);
      pos = s.find(line, pos + len);
    }while(pos != string::npos);
    }
  }while(next_permutation(tmpvec.begin(), tmpvec.end()));

  return indices;

}
int main() 
{
  string s = "barfoofoobarthefoobarman";
  vector<string>words;
  words.push_back("bar");
  words.push_back("foo");
  words.push_back("the");
  vector<int>&rs = findSubstring(s, words);
  copy(rs.begin(), rs.end(), ostream_iterator<int>(cout, " "));
  cout << endl;

  return 0;
}

CC=g++
all:
  $(CC) -std=c++11 -g -o hello helloC++.cpp -pthread -lpthread