Compilare: user.cpp: In function ‘int main()’: user.cpp:48:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < cuv[i].size() ; ++ j) ^ user.cpp:36:36: 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:38:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s + 1); ^ /tmp/ccdpdD1O.o: In function `main': user.cpp:(.text.startup+0x39): warning: the `gets' function is dangerous and should not be used.