Compilare: main.cpp: In function 'void afisare(std::vector<std::vector<int> >)': main.cpp:20:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for (int i = 1; i < ls.size(); i++) | ~~^~~~~~~~~~~ main.cpp:23:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for (int j = 0; j < ls[i].size(); j++) | ~~^~~~~~~~~~~~~~ main.cpp: In function 'void parcurgere(std::vector<std::vector<int> >, int, int)': main.cpp:40:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | for (int i = 1; i < ls.size(); i++) | ~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:67:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 67 | for (int i = 1; i < ls.size(); i++) | ~~^~~~~~~~~~~ main.cpp:69:26: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses] 69 | if (v[i] == 0 & i != s) | ~~~~~^~~~