Compilare: user.cpp: In function ‘void adauga(int, int)’: user.cpp:21:51: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] while(!vec.empty() && !(vec.back().first == x && vec.back().second == y || (vec.back().first == y && vec.back().second == x))) ^ user.cpp: In function ‘int main()’: user.cpp:71:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 1; j < s[i].size(); ++j) ^