Compilare: user.cpp: In function ‘int main()’: user.cpp:38:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (l < str[i].size() && l < str[i - 1].size() && str[i - 1][l] == str[i][l]) ^ user.cpp:38:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (l < str[i].size() && l < str[i - 1].size() && str[i - 1][l] == str[i][l]) ^ user.cpp:20:11: warning: unused variable ‘ant’ [-Wunused-variable] int mnl, ant, val, left; ^