Compilare: user.cpp: In function ‘int main()’: user.cpp:33:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < V[ nod ].size(); ++i ) { ~~^~~~~~~~~~~~~~~~~ user.cpp:17:18: warning: unused variable ‘j’ [-Wunused-variable] int n, m, i, j, x, y, nod; ^ user.cpp:14:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "sortaret.in", "r", stdin ); ^ user.cpp:15:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "sortaret.out", "w", stdout ); ^ user.cpp:19:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d", &n,&m ); ^ user.cpp:21:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d", &x,&y ); ^