Compilare: main.cpp: In function 'int main()': main.cpp:112:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 112 | for (int i = 0; i < a[1].length(); i++) | ~~^~~~~~~~~~~~~~~ main.cpp:115:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 115 | for (int j = i; j < a[1].length(); j++) | ~~^~~~~~~~~~~~~~~ main.cpp:122:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 122 | for (int k = 0; k < a[i].length(); k++) | ~~^~~~~~~~~~~~~~~ main.cpp:125:43: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 125 | for (int j = k; j < a[i].length(); j++) | ~~^~~~~~~~~~~~~~~ main.cpp:134:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 134 | for (int k = 0; k < b[i].length(); k++) | ~~^~~~~~~~~~~~~~~ main.cpp:137:43: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 137 | for (int j = k; j < b[i].length(); j++) | ~~^~~~~~~~~~~~~~~