Compilare: main.cpp: In function 'int main()': main.cpp:59:21: warning: loop variable 'vector' creates a copy from type 'const std::vector<int>' [-Wrange-loop-construct] 59 | for (const auto vector : ctc) { | ^~~~~~ main.cpp:59:21: note: use reference type to prevent copying 59 | for (const auto vector : ctc) { | ^~~~~~ | &