Compilare: main.cpp: In function 'std::vector<int> solve(const std::vector<std::vector<int> >&)': main.cpp:18:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(int j = 0;j < tmp.size();++j) | ~~^~~~~~~~~~~~ main.cpp:25:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | if(c1 + c2 == tmp.size()) | ~~~~~~~~^~~~~~~~~~~~~ main.cpp:30:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for(int i = 0;i < tmp.size();++i) | ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:47:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | for(int i = 0;i < ret.size();++i) | ~~^~~~~~~~~~~~