Compilare: user.cpp: In function 'int getCost(std::string, std::string)': user.cpp:49: warning: comparison between signed and unsigned integer expressions user.cpp:51: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void dfs(int)': user.cpp:67: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:117: warning: comparison between signed and unsigned integer expressions