Compilare: main.cpp: In function 'std::vector<int> add(std::vector<int>&, std::vector<int>&)': main.cpp:62:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 62 | for (int i = 0; i < x.size(); ++i) | ~~^~~~~~~~~~ main.cpp: In function 'bool cmp2(std::pair<std::vector<int>, int>&, std::pair<std::vector<int>, 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 < x.first.size(); ++i) | ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'bool cmp(const std::vector<int>&, const 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 < x.size(); ++i) | ~~^~~~~~~~~~ main.cpp: In function 'bool egale(const std::vector<int>&, const std::vector<int>&)': main.cpp:93:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 93 | for (int i = 0; i < x.size(); ++i) | ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:138:21: 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] 138 | for (int i = 0; i < val_a.size(); ++i) { | ~~^~~~~~~~~~~~~~ main.cpp:148:11: 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] 148 | if (j < val_b.size() - 1) | ~~^~~~~~~~~~~~~~~~~~