Compilare: main.cpp: In function 'int main()': main.cpp:56:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] gg[(c - 'a')][(p - 'a')] = (ask(pos) == pos.size()); ~~~~~~~~~^~~~~~~~~~~~~ main.cpp:97:66: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] gg[(c - 'a')][(p - 'a')] = (ask(pos) == pos.size()); ~~~~~~~~~^~~~~~~~~~~~~