Compilare: user.c: In function ‘permute’: user.c:49:3: warning: ‘return’ with no value, in function returning non-void [enabled by default] return; ^ user.c:56:4: warning: ‘return’ with no value, in function returning non-void [enabled by default] return; ^ user.c: In function ‘main’: user.c:74:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&T); ^ user.c:76:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&N); ^ user.c:77:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&M); ^ user.c:82:10: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&root[nr]->x); ^ user.c:83:10: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&root[nr]->y); ^ user.c:84:10: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&root[nr]->cost); ^