Compilare: user.cpp: In function ‘int main()’: user.cpp:49:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j<aux.length(); ++j) ^ user.cpp:63:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<p->cuvinte.size(); ++j) ^ user.cpp:38:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("litere2.in", "r", stdin); ^ user.cpp:41:10: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ /tmp/ccqhUqGF.o: In function `main': user.cpp:(.text.startup+0x67): warning: the `gets' function is dangerous and should not be used.