Compilare: main.cpp: In function 'int main()': main.cpp:72:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 72 | for(int i = 0; i < ctc.size(); i++){ | ~~^~~~~~~~~~~~ main.cpp:73:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 73 | for(int j = 0; j < ctc[i].size(); j++){ | ~~^~~~~~~~~~~~~~~