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;