Compilare: main.cpp: In function 'void Dfs(int)': main.cpp:33:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<graph[node].size(); ++i) ~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void Write()': main.cpp:84:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<ind[node].size(); ++i) ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'void Read()': main.cpp:10:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("sushi2.in","r",stdin); ^ main.cpp:11:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("sushi2.out","w",stdout); ^ main.cpp:12:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &n, &m); ^ main.cpp:16:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &x); ^ main.cpp:20:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &y); ^ main.cpp: In function 'void Solve()': main.cpp:71:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d %d", &x, &y, &t); ^