Compilare: main.cpp: In function 'void down(int)': main.cpp:29:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | while(2 * pos < v.size()) | ~~~~~~~~^~~~~~~~~~ main.cpp:32:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | if(2 * pos + 1 < v.size() && v[2 * pos + 1] < v[min_fiu]) | ~~~~~~~~~~~~^~~~~~~~~~