Compilare: user.cpp: In member function ‘int graph::sendFlows(std::vector<char>&, std::vector<int>&, std::queue<int>&)’: user.cpp:62:10: warning: unused variable ‘a’ [-Wunused-variable] int a = 5; ^ user.cpp: In function ‘int main()’: user.cpp:116:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ user.cpp:120:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &a, &b, &c); ^