Compilare: user.cpp: In function ‘int main()’: user.cpp:20:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=1;k<s.size();k++) ^ user.cpp:41:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<s.size()-1 && sem==0) ^ user.cpp:12:11: warning: unused variable ‘m’ [-Wunused-variable] int n,m,i,sem; ^ user.cpp:13:10: warning: unused variable ‘p’ [-Wunused-variable] char p; ^