Compilare: user.cpp: In function ‘ll getnr(int, int, int&)’: user.cpp:19:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p < s[l][c].size() && isdigit(s[l][c][p])) ^ user.cpp: In function ‘ll getEl(int, int, int&)’: user.cpp:27:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p < s[l][c].size() && s[l][c][p] == ':') return get(x , getnr(l,c,++p)); ^ user.cpp: In function ‘ll eval(int, int, int)’: user.cpp:34:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p < s[l][c].size() && s[l][c][p] == '+') ^