Compilare: main.cpp: In function 'int main()': main.cpp:63:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | for(int i=0; i<v[0].size(); ++i)viz[v[0][i]]=1; | ~^~~~~~~~~~~~ main.cpp:68:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 68 | for(int i=0; i<v[salut].size(); ++i)viz[v[salut][i]]=1; | ~^~~~~~~~~~~~~~~~ main.cpp:59:9: warning: unused variable 'maxi' [-Wunused-variable] 59 | int maxi=0,mini; | ^~~~