Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:15:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[x].size(); i++) if(!viz[G[x][i]]) dfs(G[x][i]); ^ user.cpp: In function ‘void forward_pass()’: user.cpp:48:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<G[current].size(); j++) maxi=max(early_finish[G[current][j]],maxi); ^ user.cpp: In function ‘void backward_pass()’: user.cpp:59:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<G_transposed[current].size(); j++) mini=min(late_start[G_transposed[current][j]],mini); ^