Compilare: main.cpp: In function 'std::vector<std::vector<char> > trans(std::vector<std::vector<char> >)': main.cpp:15:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for(int i = 0; i < m.size(); i++) { | ~~^~~~~~~~~~ main.cpp: In function 'bool good(std::vector<std::vector<char> >)': main.cpp:25:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for(int i = 0; i + 1 < x.size() / 2; i++) { | ~~~~~~^~~~~~~~~~~~~~ main.cpp:28:37: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | for(int i = x.size() / 2; i + 1 < x.size(); i++) { | ~~~~~~^~~~~~~~~~ main.cpp:31:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for(int i = x.size() / 2; i <= x.size() / 2; i++) { | ~~^~~~~~~~~~~~~~~ main.cpp:32:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for(int j = 0; j < x.size(); j++) { | ~~^~~~~~~~~~ main.cpp:33:38: warning: suggest parentheses around comparison in operand of '^' [-Wparentheses] 33 | if(x[i][j] ^ x[i - 1][j] != ('1') ^ ('0')) return false; main.cpp: In function 'std::vector<std::pair<char, std::pair<int, int> > > fm(std::vector<std::vector<char> >, char)': main.cpp:48:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | for(int i = 0; i < wl0.size(); i++) { | ~~^~~~~~~~~~~~ main.cpp:59:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 59 | for(int i = 0; i < wc0.size(); i++) { | ~~^~~~~~~~~~~~