Compilare: user.cpp: In function ‘void solve(int, int)’: user.cpp:128:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < CB[x].size(); ++j) ^ user.cpp:137:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j< CB[x].size(); ++j) ^ user.cpp: In function ‘void recon(int, int, bool)’: user.cpp:182:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<CB[x].size(); ++i) ^ user.cpp: In function ‘void solve(int, int)’: user.cpp:146:45: warning: ‘target’ may be used uninitialized in this function [-Wmaybe-uninitialized] mvc_back (0,CB[x].size(),0,target,x); ^