Compilare: user.cpp: In function ‘int main()’: user.cpp:34:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<nr.size();++i) ^ user.cpp:46:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<nr.size();++i) ^ user.cpp:55:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind<nr.size()) ^ user.cpp:61:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind<nr.size()&&nr[ind]>nr[ind-1]){++ind;++c;} ^ user.cpp:68:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ind<nr.size()&&nr[ind]<nr[ind-1]){++ind;++c;} ^