Compilare: main.cpp: In function 'int ok()': main.cpp:56:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < sol[max1].size(); i++) ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'void print()': main.cpp:64:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= sol[max1].size(); i++) ~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void back(int)': main.cpp:71:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p == sol[max1].size()+1 || stop == 1) ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:81:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= sol[max1].size(); i++) ~~^~~~~~~~~~~~~~~~~~~