Compilare: user.cpp: In function ‘int main()’: user.cpp:21:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( register int i = 1 ; i <= m ; ++i ){ ^ user.cpp:23:30: warning: narrowing conversion of ‘x’ from ‘unsigned int’ to ‘int’ inside { } [-Wnarrowing] Q.push( { 0 , x , 0} ); ^ user.cpp:32:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( *it == y ) {fprintf(fout,"%d\n",w.drum+2); ok=0; } ^ user.cpp:18:31: warning: unused variable ‘tmp’ [-Wunused-variable] register unsigned n,m,x,y,tmp,source,ok; ^ user.cpp:18:35: warning: unused variable ‘source’ [-Wunused-variable] register unsigned n,m,x,y,tmp,source,ok; ^ user.cpp:16:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("graf2.in", "r", stdin); ^ user.cpp:19:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n",&n,&m); ^ user.cpp:22:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n",&x,&y); ^