Compilare: user.cpp: In function ‘void solve(int)’: user.cpp:32:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i=0;i<v[start].size();i++) ^ user.cpp:39:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( j=0;j<v[vecin].size();j++) ^ user.cpp:56:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<v[vecin2].size();k++) ^ user.cpp:31:19: warning: variable ‘vecin2’ set but not used [-Wunused-but-set-variable] int i,j,vecin,vecin2; ^