Compilare: main.cpp: In function 'int main()': main.cpp:32:18: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 32 | if (w.size() != n * m) | ~~~~~~~~~^~~~~~~~ main.cpp:35:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for (int i = 1; i < w.size() && ok; i++) | ~~^~~~~~~~~~