Compilare: main.cpp: In function 'int find_elem(int)': main.cpp:14:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<elem.size(); i++) ~^~~~~~~~~~~~ main.cpp: In function 'void delete_value(std::vector<int>&, int)': main.cpp:78:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while((lc < heap.size() || rc < heap.size()) && (heap[f] > heap[lc] || heap[f] > heap[rc])) ~~~^~~~~~~~~~~~~ main.cpp:78:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while((lc < heap.size() || rc < heap.size()) && (heap[f] > heap[lc] || heap[f] > heap[rc])) ~~~^~~~~~~~~~~~~ main.cpp:80:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(lc < heap.size() && heap[f] > heap[lc]) ~~~^~~~~~~~~~~~~ main.cpp:89:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(rc < heap.size() && heap[f] > heap[rc]) ~~~^~~~~~~~~~~~~