Kolikot

input/code.cpp:80:3: warning: "/*" within comment [-Wcomment]
   /*for (int i = 0; i < n; i++) {
 ^
input/code.cpp: In function 'bool jei(int, std::vector<int>)':
input/code.cpp:10:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < koliket.size(); i++) {
                                      ^
input/code.cpp:19:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       } else if (i == koliket.size() - 1) {
                                        ^
input/code.cpp: In function 'int main()':
input/code.cpp:58:3: error: 's2' was not declared in this scope
   s2.push_back(v.at(n - 1));
   ^
input/code.cpp:89:57: error: expected ')' before '{' token
        std::binary_search (s2.begin(), sr.end(), i, mf) {
                                                         ^

#include <iostream>
#include <math.h>
#include <algorithm>

bool mf (int i,int j) { return (i<j);}
bool mf2 (int i,int j) { return (i>j);}

bool jei(int n, std::vector<int> koliket) {
  while (n > 0 && koliket.size() > 0) {
    for (int i = 0; i < koliket.size(); i++) {
      if (koliket.at(0) > n) {
        n -= koliket.at(0);
        koliket.erase(koliket.begin());
        break;
      } else if (koliket.at(i) > n) {
        n -= koliket.at(i - 1);
        koliket.erase(koliket.begin() + i - 1);
        break;
      } else if (i == koliket.size() - 1) {
        n -= koliket.at(koliket.size() - 1);
        koliket.erase(koliket.begin() + koliket.size() - 1);
      }
    }
    //std::cout << koliket.size() << std::endl;
  }
  if (n == 0) {
    //std::cout << og << " voidaan muodostaa" << std::endl;
    return true;
  } else {
    //std::cout << og << " ei voida muodostaa" << std::endl;
    return false;
  //  std::cout << n << std::endl;
  }

}
int main() {
	int n;
	std::vector<int> v;
  std::vector<int> s;
  std::vector<int> sr;
	std::cin >> n;
  if (n == -1) {
    v = {2,2,5,8};
    n = 4;
  } else if (n == -2) {
    v = {1,1,1,2,2,3,5,8,6,7,20};
    n = 11;
  } else {
    for (int i = 0; i < n; i++) {
      int t;
      std::cin >> t;
      v.push_back(t);
    }
  }
  std::sort(std::begin(v), std::end(v));
  s.push_back(v.at(0));
  sr.push_back(v.at(n-1));
  s2.push_back(v.at(n - 1));
  for (int i = 0; i < n; i++) {
  //  std::cout << v.at(i) << " ";
  //  if (v.at(i) < 10) {
  //    std::cout << " ";
  //  }
    if (i != 0) {
      s.push_back(s.at(i - 1) + v.at(i));
    }
    if (i != 0) {
      sr.push_back(sr.at(i - 1) + v.at(n - i - 1));
    }
  }
  for (int i = 0; i < n; i++) {
    s2.push_back(v.at(n - 1) - v.at(i));
  }
  std::reverse(sr.begin(), sr.end());
/*  std::cout << std::endl;
  for (int i = 0; i < n; i++) {
    std::cout << sr.at(i) << " ";
  }
  std::cout << std::endl;
  /*for (int i = 0; i < n; i++) {
    std::cout << s.at(i) << " ";
    if (s.at(i) < 10) {
      std::cout << " ";
    }
  }*/
  for (int i = 1; i < 10e6 + 1; i++) {
    if(std::binary_search (v.begin(), v.end(), i, mf) ||
       std::binary_search (sr.begin(), sr.end(), i, mf2) ||
       std::binary_search (s2.begin(), sr.end(), i, mf) {
      continue;
    }
    /*if (jei(i, v)) {
      continue;
    }*/
    std::cout << i <<  std::endl;
    break;
  }
  //int cmax = s.at(n - 1);
  //std::cout << std::endl;
	return 0;
}


/*
Syöte:
4
2 1 2 7

Tuloste:
6

*/