Compilare: main.cpp: In function 'int main()': main.cpp:40:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | if((retval < pozitii[el].size()) && (pozitii[el][retval] != n)){ | ~~~~~~~^~~~~~~~~~~~~~~~~~~~ main.cpp:41:33: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 41 | if(pozitii[el].size() <= (retval + 1)){ | ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~ main.cpp:46:37: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 46 | }else if(pozitii[el].size() <= retval){ | ~~~~~~~~~~~~~~~~~~~^~~~~~~~~