Compilare: user.cpp:11:22: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] #define NMAX 1 << 20 + 5 ~~~^~~ user.cpp:25:9: note: in expansion of macro ‘NMAX’ bitset <NMAX> used; ^~~~ user.cpp: In function ‘void generateSolution(int)’: user.cpp:30:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (solution.size() > (1 << N) + N - 1)return; ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~ user.cpp:33:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (solution.size() == (1 << N) + N - 1) { ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~