Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:28:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0 ; i < edge [ node ] . size() ; i ++ ) ^ user.cpp: In function ‘void dfsT(int)’: user.cpp:38:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0 ; i < edgeT [ node ] . size() ; i ++ ) ^ user.cpp: In function ‘void print()’: user.cpp:64:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( j = 0 ; j < sccs [ i ] . size() ; j ++ ) ^ user.cpp: In function ‘void read()’: user.cpp:16:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf ( f , "%d %d" , &N , &M ); ^ user.cpp:19:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf ( f , "%d %d" , &x , &y ); ^