Compilare: main.c: In function 'main': main.c:7:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d", &n, &k ); ^~~~~~~~~~~~~~~~~~~~~~~~ main.c:12:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d", &a ); ^~~~~~~~~~~~~~~~~~ main.c:23:6: warning: 'nr0' may be used uninitialized in this function [-Wmaybe-uninitialized] if ( nr0 == k ) { ^