Compilare: main.cpp: In function 'int main()': main.cpp:55:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | for (int j = 1; j < v[i].size(); j++) | ~~^~~~~~~~~~~~~ main.cpp:58:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | for (int j = 1; j + 1 < v[i].size(); j++) | ~~~~~~^~~~~~~~~~~~~