Compilare: main.cpp: In function 'int main()': main.cpp:288:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long int, std::allocator<long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 288 | for (int j = 0; j < val[i].size(); j++) { | ~~^~~~~~~~~~~~~~~ main.cpp:315:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long int, std::allocator<long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 315 | for (int j = 0; j < val[i].size(); j++) { | ~~^~~~~~~~~~~~~~~