Compilare: main.cpp: In function 'void listToMatrix(std::vector<std::pair<int, int> >*, int (*)[9])': main.cpp:22:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | for(int j = 0; j < L[i].size(); j++) | ~~^~~~~~~~~~~~~ main.cpp: In function 'void showLists(std::vector<std::pair<int, int> >*)': main.cpp:63:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | for(j = 0; j < L[i].size(); j++) { | ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:142:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 142 | for(j = 0; j < L[i].size() - 1; j++) | ~~^~~~~~~~~~~~~~~~~ main.cpp:190:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 190 | for(j = 0; j < L[i].size() - 1; j++) | ~~^~~~~~~~~~~~~~~~~