Compilare: main.cpp: In function 'int main()': main.cpp:43:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | for ( j = 0; j < same_line[i].size(); j++ ) { | ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:44:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | for ( k = j + 1; k < same_line[i].size(); k++ ){ | ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:51:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for ( j = 0; j < same_column[i].size(); j++ ) { | ~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:52:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 52 | for ( k = j + 1; k < same_column[i].size(); k++ ) { | ~~^~~~~~~~~~~~~~~~~~~~~~~