Compilare: user.cpp: In function ‘int pre_calc(int)’: user.cpp:35:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[nod].size(); i++) ^ user.cpp: In function ‘void bfs()’: user.cpp:55:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Gt[nod].size(); i++) ^ user.cpp: In function ‘void dfs(int)’: user.cpp:76:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[nod].size(); i++) ^