Compilare: user.cpp: In function ‘int main()’: user.cpp:31:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<x.size();++i) ^ user.cpp:41:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<x.size();++i) ^ user.cpp:51:35: warning: pointer to a function used in arithmetic [-Wpointer-arith] for(;!is_vowel[ind];++ind); ^ user.cpp:24:13: warning: unused variable ‘rez’ [-Wunused-variable] int n,k,rez=0,ind=0,nrv=0,r=1; ^ user.cpp:24:31: warning: unused variable ‘r’ [-Wunused-variable] int n,k,rez=0,ind=0,nrv=0,r=1; ^