Compilare: main.cpp: In function 'int main()': main.cpp:32:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for ( j = 0; j < same_line[i].size(); j++ ) { | ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:33:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | for ( k = j + 1; k < same_line[i].size(); k++ ){ | ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:40:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | for ( j = 0; j < same_column[i].size(); j++ ) { | ~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:41:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | for ( k = j + 1; k < same_column[i].size(); k++ ) { | ~~^~~~~~~~~~~~~~~~~~~~~~~