Compilare: main.cpp: In function 'std::vector<int> solve(std::vector<std::vector<int> >&)': main.cpp:13:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | for(int i = 0;i < v.size();++i) | ~~^~~~~~~~~~ main.cpp:18:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(int j = 1;j < tmp.size();++j) | ~~^~~~~~~~~~~~ main.cpp:35:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | if(seen[i] == v.size()) | ~~~~~~~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:64:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | for(int i = 0;i < ans.size() - 1;++i) | ~~^~~~~~~~~~~~~~~~