Compilare: main.cpp: In function 'void Print()': main.cpp:22:11: warning: statement has no effect [-Wunused-value] for(it; it != ans.end(); it++) ^ main.cpp: In function 'void backt(int)': main.cpp:36:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(curr.size() < minn) ~~~~~~~~~~~~^~~~~~ main.cpp:44:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(curr.size() <= minn) ~~~~~~~~~~~~^~~~~~~