Compilare: user.cpp: In function ‘int bfs()’: user.cpp:43:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v[nod].size(); i++) ~^~~~~~~~~~~~~~ user.cpp: In function ‘int flux_minim()’: user.cpp:60:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<v[n].size(); j++) ~^~~~~~~~~~~~ user.cpp: In function ‘void dfs(int, int)’: user.cpp:81:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v[nod].size(); i++) ~^~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:101:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<sol.size(); i++) ~^~~~~~~~~~~ user.cpp:89:9: warning: variable ‘fl’ set but not used [-Wunused-but-set-variable] int fl,i, nr=0; ^~