Compilare: main.cpp: In function 'int main()': main.cpp:37:67: warning: 'k' may be used uninitialized [-Wmaybe-uninitialized] 37 | int k = it.fs ^ ((1 << i) | (1 << j) | (1 << k) | (1 << l)); | ~~~^~~~~ main.cpp:37:29: note: 'k' was declared here 37 | int k = it.fs ^ ((1 << i) | (1 << j) | (1 << k) | (1 << l)); | ^