Borderou de evaluare (job #87151)

Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:15:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp: In function ‘void solve(int)’: user.cpp:37:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp: In function ‘void dfs2(int)’: user.cpp:46:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp: In function ‘int main()’: user.cpp:56:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:57:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:58:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:61:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]