Compilare: user.cpp: In function ‘void Solve()’: user.cpp:62:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < Erase[j].size(); ++ k) ^ user.cpp:75:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < Erase[j].size(); ++ k) ^ /tmp/cciAxaMf.o: In function `main': user.cpp:(.text.startup+0x7d): warning: the `gets' function is dangerous and should not be used.