Compilare: user.cpp: In function ‘void Tarjan(int)’: user.cpp:21:9: warning: unused variable ‘i’ [-Wunused-variable] int i, j, t, fiu; ^ user.cpp:21:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, t, fiu; ^ user.cpp: In function ‘int main()’: user.cpp:68:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < Sol.size(); ++i ) { ^ user.cpp:71:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( j = 0; j < Sol[ i ].size(); ++j ) { ^ user.cpp:55:27: warning: unused variable ‘d’ [-Wunused-variable] int n, m, i, j, x, y, d; ^ user.cpp:52:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "ctc.in", "r", stdin ); ^ user.cpp:53:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "ctc.out", "w", stdout ); ^ user.cpp:57:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d",&n,&m ); ^ user.cpp:59:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d",&x,&y ); ^