Compilare: user.cpp: In function ‘void Huffman()’: user.cpp:53:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(M < (int)A.size() + B.size() && A.size() + B.size() < 2 * M) { ^ user.cpp:53:70: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(M < (int)A.size() + B.size() && A.size() + B.size() < 2 * M) { ^ user.cpp: In function ‘void readData()’: user.cpp:22:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ user.cpp:24:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int x; scanf("%d", &x); ^