Compilare: user.cpp: In function ‘void DFS(int, int, int)’: user.cpp:17:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < L[nod].size(); i++) ^ user.cpp: In function ‘void DFS2(int, int, int, int)’: user.cpp:39:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < L[nod].size(); i++) ^ user.cpp: In function ‘void Solve(int, int, int)’: user.cpp:63:9: warning: unused variable ‘i’ [-Wunused-variable] int i,a,b,c; ^ user.cpp:63:11: warning: unused variable ‘a’ [-Wunused-variable] int i,a,b,c; ^ user.cpp:63:13: warning: unused variable ‘b’ [-Wunused-variable] int i,a,b,c; ^ user.cpp:63:15: warning: unused variable ‘c’ [-Wunused-variable] int i,a,b,c; ^