Compilare: main.cpp: In function 'void add(int)': main.cpp:21:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for (int j = 0; j < nr[i].size(); j++) | ~~^~~~~~~~~~~~~~ main.cpp:33:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | for (int j = 0; j < aux.size(); j++) | ~~^~~~~~~~~~~~ main.cpp: In function 'void substract(int)': main.cpp:45:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | for (int j = 0; j < nr[i].size(); j++) | ~~^~~~~~~~~~~~~~ main.cpp:60:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 60 | for (int j = 0; j < aux.size(); j++) | ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:79:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 79 | for (int j = 0; j < sum.size(); j++) | ~~^~~~~~~~~~~~