Compilare: main.cpp: In function 'int main()': main.cpp:394:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 394 | for(int i = 0; i < SOL.size(); ++i) { | ~~^~~~~~~~~~~~ main.cpp:395:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 395 | for(int j = 0; j < SOL[i].size(); ++j) | ~~^~~~~~~~~~~~~~~