Compilare: user.c: In function ‘G’: user.c:12:19: warning: operation on ‘i’ may be undefined [-Wsequence-point] if(P[i]<P[j])i^=j^=i^=j; ^ user.c: In function ‘main’: user.c:24:55: warning: value computed is not used [-Wunused-value] fr(i,0,m)scanf("%i%i%i",o+i,O+i,c+i),I[i]=i,--O[i]-o[i]--; ^ user.c:28:13: warning: unused variable ‘j’ [-Wunused-variable] int s=0,j; ^ user.c:18:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.in","r",stdin); ^ user.c:19:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.out","w",stdout); ^ user.c:21:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i%i",&n,&m); ^ user.c:24:19: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] fr(i,0,m)scanf("%i%i%i",o+i,O+i,c+i),I[i]=i,--O[i]-o[i]--; ^