Compilare: main.cpp: In function 'int main()': main.cpp:32:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for(int j = 0; j < inaltimi[i].size(); j += 2) | ~~^~~~~~~~~~~~~~~~~~~~ main.cpp:38:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for(int i = 0; i < inaltimi[0].size(); i++) | ~~^~~~~~~~~~~~~~~~~~~~