Compilare: user.cpp: In function ‘void bktr(int, int)’: user.cpp:12:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p==l) { ^ user.cpp: In function ‘int main()’: user.cpp:66:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<l; j++) ^ user.cpp:75:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<l; j++) { ^ user.cpp:37:18: warning: unused variable ‘k’ [-Wunused-variable] unsigned int k=0, n, m, i, nr; ^