Compilare: user.cpp: In function ‘int main()’: user.cpp:132:30: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 2 has type ‘std::vector<long int>::size_type {aka unsigned int}’ [-Wformat=] printf("%ld\n",Ans.size()); ^ user.cpp:133:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<Ans.size();i++) W[Ans[i]].write(); ^ user.cpp: In function ‘void readS()’: user.cpp:30:39: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(Buff,1,maxBuf,stdin); ^ user.cpp:41:39: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(Buff,1,maxBuf,stdin); ^ user.cpp: In function ‘int main()’: user.cpp:91:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mesaje.in","r",stdin); ^ user.cpp:92:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mesaje.out","w",stdout); ^ user.cpp:94:19: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] n = 0; gets(S); ^ user.cpp:111:31: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(Buff,1,maxBuf,stdin); ^ /tmp/ccvHMEkY.o: In function `main': user.cpp:(.text.startup+0x65): warning: the `gets' function is dangerous and should not be used.