func_code_string: #include <iostream>   #include <cmath>   #include <algorithm>   #include <vector>   #include <set>   #include <unordered_set>   #include <queue>   #include <deque>   #include <string>   #include <sstream>   #include <iomanip>   #include <map>   #include <unordered_map>   #include <stack>   #include <cstdio>   #include <climits>   #include <tuple>   #include <ctime>   #include <cstring>   #include <numeric>   #include <functional>   #include <chrono>   #include <cassert>   #include <bitset>   using namespace std;   using ll = long long;   const ll INF = 2e9;   vector <vector<int>> gp;   vector<int> vis;   vector<int> dist;   vector<int> v;   string fibWord(int n)   {       string Sn_1 =  0 ;       string Sn =  01 ;       string tmp;       for (int i = 2; i <= n; i++)       {           tmp = Sn;           Sn += Sn_1;           Sn_1 = tmp;       }          return Sn;   }      void solution() {       int n; cin >> n;       cout << 2 - n * n << endl;   }      int main()   {       ios_base::sync_with_stdio(false);       cin.tie(NULL);       //int T; cin >> T;       //while (T--){       solution();       //}   }