Compilare: main.cpp: In function 'int main()': main.cpp:24:23: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 24 | while (sol.size() != n) | ~~~~~~~~~~~^~~~ main.cpp:31:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for (j = 0; j < a[i].size(); j ++) | ~~^~~~~~~~~~~~~ main.cpp:38:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for (i = 0; i < sol.size(); i ++) | ~~^~~~~~~~~~~~