Compilare: main.cpp: In function 'std::vector<int> add(std::vector<int>, std::vector<int>)': main.cpp:55:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | for (int i = 0; i < a.size(); ++i) | ~~^~~~~~~~~~ main.cpp: In function 'bool cmp(std::pair<std::vector<int>, int>&, std::pair<std::vector<int>, int>&)': main.cpp:72:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 72 | for (int i = 0; i < a.first.size(); ++i) | ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'bool cmp(std::vector<int>, std::vector<int>)': main.cpp:79:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 79 | for (int i = 0; i < a.size(); ++i) | ~~^~~~~~~~~~ main.cpp: In function 'bool egale(std::vector<int>, std::vector<int>&)': main.cpp:86:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 86 | for (int i = 0; i < a.size(); ++i) | ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:116:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::vector<int>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 116 | for (int i = 0; i < val_a.size(); ++i) { | ~~^~~~~~~~~~~~~~ main.cpp:130:29: warning: 'cnt' may be used uninitialized in this function [-Wmaybe-uninitialized] 130 | cout << "1\n" << cnt << "\n"; | ^~~~