Eroare de compilare: main.cpp: In function 'bool isok(std::vector<int>&, std::vector<std::vector<int> >&, int, int, std::vector<std::vector<char> >&)': main.cpp:26:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | if(p == a.size()) | ~~^~~~~~~~~~~ main.cpp:27:30: warning: suggest parentheses around assignment used as truth value [-Wparentheses] 27 | return memo[p][mask] = true; main.cpp:32:34: warning: suggest parentheses around assignment used as truth value [-Wparentheses] 32 | return memo[p][mask] = true; main.cpp:34:26: warning: suggest parentheses around assignment used as truth value [-Wparentheses] 34 | return memo[p][mask] = false; main.cpp: In function 'void gen(std::vector<int>&, int, int&, int&, std::vector<std::vector<int> >&)': main.cpp:43:29: error: invalid initialization of reference of type 'std::vector<std::vector<char> >&' from expression of type 'char [21][1048576]' 43 | if(isok(a, f, 0, 1, memo)) | ^~~~ main.cpp:23:90: note: in passing argument 5 of 'bool isok(std::vector<int>&, std::vector<std::vector<int> >&, int, int, std::vector<std::vector<char> >&)' 23 | bool isok(vector<int> &a, vector<vector<int>> &f, int mask, int p, vector<vector<char>> &memo) { | ~~~~~~~~~~~~~~~~~~~~~~^~~~ main.cpp:39:13: warning: unused variable 'n' [-Wunused-variable] 39 | int n = f.size(); | ^ Non zero exit status: 1