Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:21:20: error: ‘strlen’ was not declared in this scope int N = strlen(buf); ^ user.cpp:50:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<words.size(); ++i) ^ user.cpp:52:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] printf("%s%s", words[i].c_str(), i+1 == words.size() ? "":" "); ^ user.cpp:20:23: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(buf, sz, stdin); ^