Compilare: user.c: In function ‘solve’: user.c:42:8: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.c: In function ‘read’: user.c:30:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n",&n,&m); ^ user.c:32:8: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d\n",&c[i].t,&c[i].c,&c[i].b); ^ user.c: In function ‘main’: user.c:62:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(infile,"r",stdin); ^ user.c:63:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(outfile,"w",stdout); ^