Compilare: user.cpp: In function ‘void DFS1(int)’: user.cpp:19:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp: In function ‘void DFS2(int)’: user.cpp:28:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<vt[x].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:56:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<gc[i].size();j++) ^ user.cpp:32:15: warning: unused variable ‘x2’ [-Wunused-variable] { int i,j,x,y,x2,y2; ^ user.cpp:32:18: warning: unused variable ‘y2’ [-Wunused-variable] { int i,j,x,y,x2,y2; ^