Compilare: user.cpp: In function ‘int main()’: user.cpp:58:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < headers.size(); ++ i) ^ user.cpp:60:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < elements.size(); ++ i) ^ user.cpp:21:6: warning: unused variable ‘H’ [-Wunused-variable] int H, fline, i; ^ user.cpp:23:26: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(FIN, "r", stdin); ^ user.cpp:24:28: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(FOUT, "w", stdout); ^ user.cpp:33:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (str.clear(), scanf("%c", &c); c != '"'; scanf("%c", &c)) ^ user.cpp:33:4: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (str.clear(), scanf("%c", &c); c != '"'; scanf("%c", &c)) ^ user.cpp:41:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (scanf("%c", &c); is_whitespace(c); scanf("%c", &c)); ^ user.cpp:41:4: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (scanf("%c", &c); is_whitespace(c); scanf("%c", &c)); ^ user.cpp:44:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (str.clear(), scanf("%c", &c); c != '"'; scanf("%c", &c)) ^ user.cpp:44:5: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (str.clear(), scanf("%c", &c); c != '"'; scanf("%c", &c)) ^ user.cpp:47:5: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (str.clear(); c >= '0' && c <= '9'; scanf("%c", &c)) ^