Compilare: user.cpp: In function ‘int main()’: user.cpp:61:20: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if ((1 << j) & mask) ^ user.cpp:70:24: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (b[i - 1][j]) ^ user.cpp:90:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < answer.size(); i++) ^