Compilare: user.cpp: In member function ‘void heap::pop()’: user.cpp:36:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ( sn < v.size() ^ user.cpp:37:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] && ( v[n] < v[sn] || sn < v.size() - 1 && v[n] < v[sn + 1] ) ) { ^ user.cpp:37:46: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] && ( v[n] < v[sn] || sn < v.size() - 1 && v[n] < v[sn + 1] ) ) { ^