Compilare: main.cpp: In function 'int main()': main.cpp:87:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 87 | for (i = 0; i < sol.size(); ++i) | ~~^~~~~~~~~~~~ main.cpp:74:19: warning: 'k' may be used uninitialized [-Wmaybe-uninitialized] 74 | for (i = 1; i <= k; ++i) | ~~^~~~ main.cpp:64:15: note: 'k' was declared here 64 | int i, j, k; | ^