Compilare: main.cpp: In function 'int main()': main.cpp:25:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for (int i = 0; i < v.size(); i++) | ~~^~~~~~~~~~ main.cpp:28:18: warning: 'val' may be used uninitialized [-Wmaybe-uninitialized] 28 | fout << val << " " << cnt; | ^~~ main.cpp:10:16: note: 'val' was declared here 10 | int cnt = 0, val; | ^~~