Compilare: user.cpp: In function ‘int main()’: user.cpp:54:85: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( v[config.front().x] > 1 || v[config.back().x] > 1 && config.size() > t) ^ user.cpp:54:66: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] while( v[config.front().x] > 1 || v[config.back().x] > 1 && config.size() > t) ^