Compilare: user.cpp: In function ‘void df(int)’: user.cpp:19:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:56:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<trans[x].size();j++) ^ user.cpp:78:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<g[x].size();j++) ^ user.cpp:26:16: warning: unused variable ‘b’ [-Wunused-variable] {int n,m,i,j,a,b,sol=0; ^