Compilare: main.cpp: In function 'bool cmp(coloana, coloana)': main.cpp:17:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.p.size(); ++i){ ~~^~~~~~~~~~~~ main.cpp: In function 'bool Egale(coloana&, coloana&)': main.cpp:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.p.size(); ++i){ ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:67:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < c1.size(); ++i){ ~~^~~~~~~~~~~