Compilare: user.cpp: In function ‘int main()’: user.cpp:39:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < nextState.size(); ++i) ~~^~~~~~~~~~~~~~~~~~ user.cpp:59:9: warning: variable ‘cost’ set but not used [-Wunused-but-set-variable] int cost, state, newState, newCost; ^~~~