Compilare: main.cpp: In function 'std::vector<int> rank_cats(std::vector<int>, std::vector<int>, std::vector<int>)': main.cpp:69:21: warning: unused variable 'x' [-Wunused-variable] 69 | int n,i,j,imp=0,x,y,z; | ^ main.cpp:69:23: warning: unused variable 'y' [-Wunused-variable] 69 | int n,i,j,imp=0,x,y,z; | ^ main.cpp:69:25: warning: unused variable 'z' [-Wunused-variable] 69 | int n,i,j,imp=0,x,y,z; | ^ main.cpp: In function 'int main()': main.cpp:180:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 180 | for(i=0; i<rez.size(); i++) | ~^~~~~~~~~~~