Compilare: main.cpp: In function 'int BFS(int, int)': main.cpp:30:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<vec[x.first].size(); j++) ~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int Get_Flux(int, int)': main.cpp:58:17: warning: unused variable 'p' [-Wunused-variable] int p = parent[x]; ^ main.cpp:51:9: warning: unused variable 'ok' [-Wunused-variable] int ok; ^~ main.cpp: In function 'int main()': main.cpp:73:17: warning: unused variable 'f' [-Wunused-variable] int x,y,f; ^