Compilare: user.cpp: In function ‘int my_find(int)’: user.cpp:129:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 2; i <= s.size() && el < val; i ++) ^ user.cpp: In function ‘void afis(int)’: user.cpp:197:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i <= s.size() && el < val; i ++) ^ user.cpp: In function ‘int main()’: user.cpp:238:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 1; j <= s.size() && k < n; j ++) ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:12:38: 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, 4096, fin); ^