Compilare: user.cpp: In function ‘int main()’: user.cpp:49:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<dq.size();++i) if(x < dq[i]) {pos = i-1; break;} ^ user.cpp:51:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos + 1 < dq.size() - pos - 1) op2(pos+1); ^ user.cpp:78:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nr < dq.size() - nr) op2(nr); ^ user.cpp:85:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nr < dq.size() - nr) op3(nr); ^ user.cpp:99:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dq.front()-1 < dq.size()-dq.front()+1) op3(dq.front()-1); ^ user.cpp:104:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sol.size();++i) g<<sol[i]; g<<"\n"; ^ user.cpp:51:40: warning: ‘pos’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(pos + 1 < dq.size() - pos - 1) op2(pos+1); ^