Compilare: user.cpp: In function ‘void delu(int)’: user.cpp:49:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i * 2 < heapu.size()) ^ user.cpp:54:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i*2 + 1 < heapu.size() && heapu[i*2+1] < heapu[i*2]) ^ user.cpp:51:13: warning: variable ‘val’ set but not used [-Wunused-but-set-variable] int val = heapu[i*2]; ^