Compilare: main.cpp: In function 'int main()': main.cpp:67:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<cv>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 67 | while(aux<query[bucket].size() && query[bucket][aux].r==i) | ~~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:53:13: warning: unused variable 'first' [-Wunused-variable] 53 | int first=bucket*block+1; | ^~~~~