Compilare: main.cpp: In function 'int main()': main.cpp:34:25: warning: loop variable 'j' creates a copy from type 'const std::pair<int, int>' [-Wrange-loop-construct] 34 | for (const auto j : arr) { | ^ main.cpp:34:25: note: use reference type to prevent copying 34 | for (const auto j : arr) { | ^ | & main.cpp:31:9: warning: unused variable 'l' [-Wunused-variable] 31 | int l = 0; | ^