Compilare: user.cpp:3:15: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] #define base 1<<20 ^ user.cpp:11:25: note: in expansion of macro ‘base’ int conv[2500],sum,bits[base+1],n; ^ user.cpp: In function ‘int decompose(std::string)’: user.cpp:26:19: warning: unused variable ‘len’ [-Wunused-variable] int rest = 0, len = s.length(); ^