Borderou de evaluare (job #398270)

Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:43:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp: In function ‘void umple(int)’: user.cpp:50:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp: In function ‘int main()’: user.cpp:75:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:83:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:98:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:57:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:58:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp: In function ‘char next_char()’: user.cpp:17:32: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]