Compilare: user.cpp: In function ‘int main()’: user.cpp:102:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(heap.size() > k) ^ user.cpp:105:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(heap.size() < k || it.first - it.second < 0 || (heap.size() && it.first - it.second < heap.top())) ^ user.cpp:117:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(heap.size() == k) ^ user.cpp: In function ‘int solve1()’: user.cpp:64:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘void Winner(int&, int&, int&)’: user.cpp:46:17: warning: ‘win’ may be used uninitialized in this function [-Wmaybe-uninitialized] w = -win; ^