Compilare: main.cpp: In function 'int main()': main.cpp:39:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<elem>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | for (int index = 1; index < vec.size(); index++) { | ~~~~~~^~~~~~~~~~~~ main.cpp:72:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<elem>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 72 | for (pos = 0; pos < vec.size(); pos++) { | ~~~~^~~~~~~~~~~~ main.cpp:82:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<elem>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 82 | for (; pos < vec.size(); pos++) { | ~~~~^~~~~~~~~~~~ main.cpp:68:33: warning: 'ans1' may be used uninitialized in this function [-Wmaybe-uninitialized] 68 | fout << vec.size() << '\n' << ans1; | ^~~~