Compilare: main.cpp: In function 'int main()': main.cpp:29:34: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] 29 | rev[mask]+=(1<<m-1-bit); | ~~~^~~~ main.cpp:83:13: warning: 'start' may be used uninitialized [-Wmaybe-uninitialized] 83 | mask^=fst[mask]; | ~~~~^~~~~~~~~~~ main.cpp:32:9: note: 'start' was declared here 32 | int start; | ^~~~~