Compilare: main.cpp: In function 'int main()': main.cpp:74:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 74 | for (int i = 0; i < ctc.size(); ++i) { | ~~^~~~~~~~~~~~ main.cpp:75:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 75 | for (int j = 0; j < ctc[i].size(); ++j) { | ~~^~~~~~~~~~~~~~~