Compilare: main.cpp: In function 'void fill(int, int, int, int, std::vector<std::vector<int> >&, std::vector<std::vector<int> >&)': main.cpp:17:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | if(i < padure.size() - 1) | ~~^~~~~~~~~~~~~~~~~~~ main.cpp:23:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | if(j < padure[i].size() - 1) | ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:61:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 61 | if (i < padure.size() - 1){ | ~~^~~~~~~~~~~~~~~~~~~ main.cpp:77:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 77 | if(j < padure[i].size() - 1) { | ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:44:9: warning: unused variable 'last_i' [-Wunused-variable] 44 | int last_i, last_j; | ^~~~~~ main.cpp:44:17: warning: unused variable 'last_j' [-Wunused-variable] 44 | int last_i, last_j; | ^~~~~~