Compilare: main.cpp: In function 'int main()': main.cpp:81:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 81 | for (int i = 0; i < lin_type1[0].size(); i++) { | ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:86:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 86 | for (int i = 0; i < lin_type2[0].size(); i++) { | ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:92:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 92 | for (int i = 0; i < col_type1[0].size(); i++) { | ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:97:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 97 | for (int i = 0; i < col_type2[0].size(); i++) { | ~~^~~~~~~~~~~~~~~~~~~~~