Compilare: main.cpp: In function 'void dfs1(int)': main.cpp:19:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Ad[u].size();++i) ~^~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int, int)': main.cpp:40:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Add[u].size();++i) ~^~~~~~~~~~~~~~ main.cpp: In function 'void ceva()': main.cpp:77:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<Ad[i].size();++j) ~^~~~~~~~~~~~~ main.cpp: In function 'void bfs(int, int)': main.cpp:96:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Ad2[u].size();++i) ~^~~~~~~~~~~~~~ main.cpp:103:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Add2[u].size();++i) ~^~~~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:114:13: warning: unused variable 'x' [-Wunused-variable] int s,f,x,y; ^ main.cpp:114:15: warning: unused variable 'y' [-Wunused-variable] int s,f,x,y; ^