SCRATCH SHOULD SOLVE PROBLEMS LIKE THIS K THX BAI

1+1=3
i have t0 wait 60 sec0nds bef0re i can p0st this
let me try again

scratchmaster295 wrote:

1+1=3
i have t0 wait 60 sec0nds bef0re i can p0st this
let me try again

youræ wrong! 1 + 1 = 11

Truck11111 wrote:

scratchmaster295 wrote:

1+1=3
i have t0 wait 60 sec0nds bef0re i can p0st this
let me try again

youræ wrong! 1 + 1 = 11

bruh 1 + 1 = 22

Truck11111 wrote:

scratchmaster295 wrote:

1+1=3
i have t0 wait 60 sec0nds bef0re i can p0st this
let me try again

youræ wrong! 1 + 1 = 11

WEONF;\ITS WIDNOW

i sold and copyrighted math

Support, looks fairly easy to implement:
I see no reason not to add this.

Fupicat wrote:

Support, looks fairly easy to implement:

struct group_info init_groups = { .usage = ATOMIC_INIT(2) };

struct group_info *groups_alloc(int gidsetsize){

	struct group_info *group_info;

	int nblocks;

	int i;



	nblocks = (gidsetsize + NGROUPS_PER_BLOCK - 1) / NGROUPS_PER_BLOCK;

	/* Make sure we always allocate at least one indirect block pointer */

	nblocks = nblocks ? : 1;

	group_info = kmalloc(sizeof(*group_info) + nblocks*sizeof(gid_t *), GFP_USER);

	if (!group_info)

		return NULL;

	group_info->ngroups = gidsetsize;

	group_info->nblocks = nblocks;

	atomic_set(&group_info->usage, 1);



	if (gidsetsize <= NGROUPS_SMALL)

		group_info->blocks[0] = group_info->small_block;

	else {

		for (i = 0; i < nblocks; i++) {

			gid_t *b;

			b = (void *)__get_free_page(GFP_USER);

			if (!b)

				goto out_undo_partial_alloc;

			group_info->blocks[i] = b;

		}

	}

	return group_info;



out_undo_partial_alloc:

	while (--i >= 0) {

		free_page((unsigned long)group_info->blocks[i]);

	}

	kfree(group_info);

	return NULL;

}



EXPORT_SYMBOL(groups_alloc);



void groups_free(struct group_info *group_info)

{

	if (group_info->blocks[0] != group_info->small_block) {

		int i;

		for (i = 0; i < group_info->nblocks; i++)

			free_page((unsigned long)group_info->blocks[i]);

	}

	kfree(group_info);

}



EXPORT_SYMBOL(groups_free);



/* export the group_info to a user-space array */

static int groups_to_user(gid_t __user *grouplist,

			  const struct group_info *group_info)

{

	int i;

	unsigned int count = group_info->ngroups;



	for (i = 0; i < group_info->nblocks; i++) {

		unsigned int cp_count = min(NGROUPS_PER_BLOCK, count);

		unsigned int len = cp_count * sizeof(*grouplist);



		if (copy_to_user(grouplist, group_info->blocks[i], len))

			return -EFAULT;



		grouplist += NGROUPS_PER_BLOCK;

		count -= cp_count;

	}

	return 0;

}



/* fill a group_info from a user-space array - it must be allocated already */

static int groups_from_user(struct group_info *group_info,

    gid_t __user *grouplist)

{

	int i;

	unsigned int count = group_info->ngroups;



	for (i = 0; i < group_info->nblocks; i++) {

		unsigned int cp_count = min(NGROUPS_PER_BLOCK, count);

		unsigned int len = cp_count * sizeof(*grouplist);



		if (copy_from_user(group_info->blocks[i], grouplist, len))

			return -EFAULT;



		grouplist += NGROUPS_PER_BLOCK;

		count -= cp_count;

	}

	return 0;

}



/* a simple Shell sort */

static void groups_sort(struct group_info *group_info)

{

	int base, max, stride;

	int gidsetsize = group_info->ngroups;



	for (stride = 1; stride < gidsetsize; stride = 3 * stride + 1)

		; /* nothing */

	stride /= 3;



	while (stride) {

		max = gidsetsize - stride;

		for (base = 0; base < max; base++) {

			int left = base;

			int right = left + stride;

			gid_t tmp = GROUP_AT(group_info, right);



			while (left >= 0 && GROUP_AT(group_info, left) > tmp) {

				GROUP_AT(group_info, right) =

				    GROUP_AT(group_info, left);

				right = left;

				left -= stride;

			}

			GROUP_AT(group_info, right) = tmp;

		}

		stride /= 3;

	}

}



/* a simple bsearch */

int groups_search(const struct group_info *group_info, gid_t grp)

{

	unsigned int left, right;



	if (!group_info)

		return 0;



	left = 0;

	right = group_info->ngroups;

	while (left < right) {

		unsigned int mid = left + (right - left)/2;

		if (grp > GROUP_AT(group_info, mid))

			left = mid + 1;

		else if (grp < GROUP_AT(group_info, mid))

			right = mid;

		else

			return 1;

	}

	return 0;

}



/**

 * set_groups - Change a group subscription in a set of credentials

 * @new: The newly prepared set of credentials to alter

 * @group_info: The group list to install

 *

 * Validate a group subscription and, if valid, insert it into a set

 * of credentials.

 */

int set_groups(struct cred *new, struct group_info *group_info)

{

	put_group_info(new->group_info);

	groups_sort(group_info);

	get_group_info(group_info);

	new->group_info = group_info;

	return 0;

}



EXPORT_SYMBOL(set_groups);



/**

 * set_current_groups - Change current's group subscription

 * @group_info: The group list to impose

 *

 * Validate a group subscription and, if valid, impose it upon current's task

 * security record.

 */

int set_current_groups(struct group_info *group_info)

{

	struct cred *new;

	int ret;



	new = prepare_creds();

	if (!new)

		return -ENOMEM;



	ret = set_groups(new, group_info);

	if (ret < 0) {

		abort_creds(new);

		return ret;

	}



	return commit_creds(new);

}



EXPORT_SYMBOL(set_current_groups);



SYSCALL_DEFINE2(getgroups, int, gidsetsize, gid_t __user *, grouplist)

{

	const struct cred *cred = current_cred();

	int i;



	if (gidsetsize < 0)

		return -EINVAL;



	/* no need to grab task_lock here; it cannot change */

	i = cred->group_info->ngroups;

	if (gidsetsize) {

		if (i > gidsetsize) {

			i = -EINVAL;

			goto out;

		}

		if (groups_to_user(grouplist, cred->group_info)) {

			i = -EFAULT;

			goto out;

		}

	}

out:

	return i;

}



/*

 *	SMP: Our groups are copy-on-write. We can set them safely

 *	without another task interfering.

 */



SYSCALL_DEFINE2(setgroups, int, gidsetsize, gid_t __user *, grouplist)

{

	struct group_info *group_info;

	int retval;



	if (!nsown_capable(CAP_SETGID))

		return -EPERM;

	if ((unsigned)gidsetsize > NGROUPS_MAX)

		return -EINVAL;



	group_info = groups_alloc(gidsetsize);

	if (!group_info)

		return -ENOMEM;

	retval = groups_from_user(group_info, grouplist);

	if (retval) {

		put_group_info(group_info);

		return retval;

	}



	retval = set_current_groups(group_info);

	put_group_info(group_info);



	return retval;

}



/*

 * Check whether we're fsgid/egid or in the supplemental group..

 */

int in_group_p(gid_t grp)

{

	const struct cred *cred = current_cred();

	int retval = 1;



	if (grp != cred->fsgid)

		retval = groups_search(cred->group_info, grp);

	return retval;

}



EXPORT_SYMBOL(in_group_p);



int in_egroup_p(gid_t grp)

{

	const struct cred *cred = current_cred();

	int retval = 1;



	if (grp != cred->egid)

		retval = groups_search(cred->group_info, grp);

	return retval;

}

I see no reason not to add this.

This is too confusing to New Scratchers. Suggestion rejected.

4782202788054612029528392986600059097414971724022365008513345109918378950942662970278927686112707894586824720981524256319306585052676834087480834429433264797425893247623688331021633208954847354805799943341309825989013743806187109581043148680813778321530496715601563282624414040398143207622036272190408590790537203475256105564071579263867875240985573356522656108542128577321057879052328865035355873615679363655889925711574420153832091752422843046918811427400662135559303516853703976812686385750376227787949580582081831261725701003498206512329872677233489510953469375683037038373999696771585788905639115522613405495707184524158219208223766442059014593330657009722153962376853423770486138578089775621301167811299166407361746606697808186757966914671246073712904200588408923186387737887675292886953797066980967406053530122853539036965490224784924649007954898678503314655546475504501686187354866964374552614120640782949622452027788962138602665933147687696322089504278791624651519312327831756553779377194524673395819281486668576384019590720179413349582970319393884388810494546040342087536563628332152073181614300721769371426238517540520845214665313301183551962591849558938499025348780376716477073930634436840084468255937443451690315999349137664638968972614199015304906547819056227171224947070739716300953775743441307920501863532234466545645695774331885044978250148663467372130392099894852145190998232878772486650513010816769902892518719250066947215706536216248696240569256865554296221552211560427778662545936998801070186162601476474293459830183651273363462732675883060701410359254829149774339297173680765610959599911309189788238350131635672661435969218239977196933874395403996623675580528211207136396370858056051160781770985452576988032333812939272752101944629527490313835551985197095928885236415301789218675141014541203096191270934369039522098280317668942061325572349643638403056487349290884223786292887472231219032385281034091824306618947740727265524284893304474861454942076799041739447165838281671410435831206790501914527326287370339974707206016882562827404270170322606727980343479326425730091839813077719322455394763960606588214326603156141490740557698055166263044447583756711516490181193442236859424151843795389335765432129944054855345155859273424561825146813714720606287781021240923708021492298349635179527270302962970156927686511635050080407282674252362644695710769768866137302789313609674382719017385508484663373476120843567983065059558072935110637544240807350667082987233779768874938983584523095638996120616318634391967112086464384649470963230072729200912586147267999762496709852769503535733924416202657720741248683592202828983311140833923302433917797976990311425843619350936754483811194408812763388084204451804912454383884180800945275626668057628954763384641305107753773247082495804533355717481965025070819730466422826105697510564289798951182192885976352229053898948737614642139910911535864505818992696826225754111

E_Equals_EmCeCube3 wrote:

Fupicat wrote:

Support, looks fairly easy to implement:

struct group_info init_groups = { .usage = ATOMIC_INIT(2) };

struct group_info *groups_alloc(int gidsetsize){

	struct group_info *group_info;

	int nblocks;

	int i;



	nblocks = (gidsetsize + NGROUPS_PER_BLOCK - 1) / NGROUPS_PER_BLOCK;

	/* Make sure we always allocate at least one indirect block pointer */

	nblocks = nblocks ? : 1;

	group_info = kmalloc(sizeof(*group_info) + nblocks*sizeof(gid_t *), GFP_USER);

	if (!group_info)

		return NULL;

	group_info->ngroups = gidsetsize;

	group_info->nblocks = nblocks;

	atomic_set(&group_info->usage, 1);



	if (gidsetsize <= NGROUPS_SMALL)

		group_info->blocks[0] = group_info->small_block;

	else {

		for (i = 0; i < nblocks; i++) {

			gid_t *b;

			b = (void *)__get_free_page(GFP_USER);

			if (!b)

				goto out_undo_partial_alloc;

			group_info->blocks[i] = b;

		}

	}

	return group_info;



out_undo_partial_alloc:

	while (--i >= 0) {

		free_page((unsigned long)group_info->blocks[i]);

	}

	kfree(group_info);

	return NULL;

}



EXPORT_SYMBOL(groups_alloc);



void groups_free(struct group_info *group_info)

{

	if (group_info->blocks[0] != group_info->small_block) {

		int i;

		for (i = 0; i < group_info->nblocks; i++)

			free_page((unsigned long)group_info->blocks[i]);

	}

	kfree(group_info);

}



EXPORT_SYMBOL(groups_free);



/* export the group_info to a user-space array */

static int groups_to_user(gid_t __user *grouplist,

			  const struct group_info *group_info)

{

	int i;

	unsigned int count = group_info->ngroups;



	for (i = 0; i < group_info->nblocks; i++) {

		unsigned int cp_count = min(NGROUPS_PER_BLOCK, count);

		unsigned int len = cp_count * sizeof(*grouplist);



		if (copy_to_user(grouplist, group_info->blocks[i], len))

			return -EFAULT;



		grouplist += NGROUPS_PER_BLOCK;

		count -= cp_count;

	}

	return 0;

}



/* fill a group_info from a user-space array - it must be allocated already */

static int groups_from_user(struct group_info *group_info,

    gid_t __user *grouplist)

{

	int i;

	unsigned int count = group_info->ngroups;



	for (i = 0; i < group_info->nblocks; i++) {

		unsigned int cp_count = min(NGROUPS_PER_BLOCK, count);

		unsigned int len = cp_count * sizeof(*grouplist);



		if (copy_from_user(group_info->blocks[i], grouplist, len))

			return -EFAULT;



		grouplist += NGROUPS_PER_BLOCK;

		count -= cp_count;

	}

	return 0;

}



/* a simple Shell sort */

static void groups_sort(struct group_info *group_info)

{

	int base, max, stride;

	int gidsetsize = group_info->ngroups;



	for (stride = 1; stride < gidsetsize; stride = 3 * stride + 1)

		; /* nothing */

	stride /= 3;



	while (stride) {

		max = gidsetsize - stride;

		for (base = 0; base < max; base++) {

			int left = base;

			int right = left + stride;

			gid_t tmp = GROUP_AT(group_info, right);



			while (left >= 0 && GROUP_AT(group_info, left) > tmp) {

				GROUP_AT(group_info, right) =

				    GROUP_AT(group_info, left);

				right = left;

				left -= stride;

			}

			GROUP_AT(group_info, right) = tmp;

		}

		stride /= 3;

	}

}



/* a simple bsearch */

int groups_search(const struct group_info *group_info, gid_t grp)

{

	unsigned int left, right;



	if (!group_info)

		return 0;



	left = 0;

	right = group_info->ngroups;

	while (left < right) {

		unsigned int mid = left + (right - left)/2;

		if (grp > GROUP_AT(group_info, mid))

			left = mid + 1;

		else if (grp < GROUP_AT(group_info, mid))

			right = mid;

		else

			return 1;

	}

	return 0;

}



/**

 * set_groups - Change a group subscription in a set of credentials

 * @new: The newly prepared set of credentials to alter

 * @group_info: The group list to install

 *

 * Validate a group subscription and, if valid, insert it into a set

 * of credentials.

 */

int set_groups(struct cred *new, struct group_info *group_info)

{

	put_group_info(new->group_info);

	groups_sort(group_info);

	get_group_info(group_info);

	new->group_info = group_info;

	return 0;

}



EXPORT_SYMBOL(set_groups);



/**

 * set_current_groups - Change current's group subscription

 * @group_info: The group list to impose

 *

 * Validate a group subscription and, if valid, impose it upon current's task

 * security record.

 */

int set_current_groups(struct group_info *group_info)

{

	struct cred *new;

	int ret;



	new = prepare_creds();

	if (!new)

		return -ENOMEM;



	ret = set_groups(new, group_info);

	if (ret < 0) {

		abort_creds(new);

		return ret;

	}



	return commit_creds(new);

}



EXPORT_SYMBOL(set_current_groups);



SYSCALL_DEFINE2(getgroups, int, gidsetsize, gid_t __user *, grouplist)

{

	const struct cred *cred = current_cred();

	int i;



	if (gidsetsize < 0)

		return -EINVAL;



	/* no need to grab task_lock here; it cannot change */

	i = cred->group_info->ngroups;

	if (gidsetsize) {

		if (i > gidsetsize) {

			i = -EINVAL;

			goto out;

		}

		if (groups_to_user(grouplist, cred->group_info)) {

			i = -EFAULT;

			goto out;

		}

	}

out:

	return i;

}



/*

 *	SMP: Our groups are copy-on-write. We can set them safely

 *	without another task interfering.

 */



SYSCALL_DEFINE2(setgroups, int, gidsetsize, gid_t __user *, grouplist)

{

	struct group_info *group_info;

	int retval;



	if (!nsown_capable(CAP_SETGID))

		return -EPERM;

	if ((unsigned)gidsetsize > NGROUPS_MAX)

		return -EINVAL;



	group_info = groups_alloc(gidsetsize);

	if (!group_info)

		return -ENOMEM;

	retval = groups_from_user(group_info, grouplist);

	if (retval) {

		put_group_info(group_info);

		return retval;

	}



	retval = set_current_groups(group_info);

	put_group_info(group_info);



	return retval;

}



/*

 * Check whether we're fsgid/egid or in the supplemental group..

 */

int in_group_p(gid_t grp)

{

	const struct cred *cred = current_cred();

	int retval = 1;



	if (grp != cred->fsgid)

		retval = groups_search(cred->group_info, grp);

	return retval;

}



EXPORT_SYMBOL(in_group_p);



int in_egroup_p(gid_t grp)

{

	const struct cred *cred = current_cred();

	int retval = 1;



	if (grp != cred->egid)

		retval = groups_search(cred->group_info, grp);

	return retval;

}

I see no reason not to add this.

This is too confusing to New Scratchers. Suggestion rejected.

This is all automated, new scratchers won't even see the code.

chrdagos wrote:

4782202788054612029528392986600059097414971724022365008513345109918378950942662970278927686112707894586824720981524256319306585052676834087480834429433264797425893247623688331021633208954847354805799943341309825989013743806187109581043148680813778321530496715601563282624414040398143207622036272190408590790537203475256105564071579263867875240985573356522656108542128577321057879052328865035355873615679363655889925711574420153832091752422843046918811427400662135559303516853703976812686385750376227787949580582081831261725701003498206512329872677233489510953469375683037038373999696771585788905639115522613405495707184524158219208223766442059014593330657009722153962376853423770486138578089775621301167811299166407361746606697808186757966914671246073712904200588408923186387737887675292886953797066980967406053530122853539036965490224784924649007954898678503314655546475504501686187354866964374552614120640782949622452027788962138602665933147687696322089504278791624651519312327831756553779377194524673395819281486668576384019590720179413349582970319393884388810494546040342087536563628332152073181614300721769371426238517540520845214665313301183551962591849558938499025348780376716477073930634436840084468255937443451690315999349137664638968972614199015304906547819056227171224947070739716300953775743441307920501863532234466545645695774331885044978250148663467372130392099894852145190998232878772486650513010816769902892518719250066947215706536216248696240569256865554296221552211560427778662545936998801070186162601476474293459830183651273363462732675883060701410359254829149774339297173680765610959599911309189788238350131635672661435969218239977196933874395403996623675580528211207136396370858056051160781770985452576988032333812939272752101944629527490313835551985197095928885236415301789218675141014541203096191270934369039522098280317668942061325572349643638403056487349290884223786292887472231219032385281034091824306618947740727265524284893304474861454942076799041739447165838281671410435831206790501914527326287370339974707206016882562827404270170322606727980343479326425730091839813077719322455394763960606588214326603156141490740557698055166263044447583756711516490181193442236859424151843795389335765432129944054855345155859273424561825146813714720606287781021240923708021492298349635179527270302962970156927686511635050080407282674252362644695710769768866137302789313609674382719017385508484663373476120843567983065059558072935110637544240807350667082987233779768874938983584523095638996120616318634391967112086464384649470963230072729200912586147267999762496709852769503535733924416202657720741248683592202828983311140833923302433917797976990311425843619350936754483811194408812763388084204451804912454383884180800945275626668057628954763384641305107753773247082495804533355717481965025070819730466422826105697510564289798951182192885976352229053898948737614642139910911535864505818992696826225754111

UGH THAT WASN'T THE ANSWER I WAS LOOKIGN FOR UGH

here you are
9 + 10 = 21

im a big brain

BUMP;
U
<
O

no that would be too much work

sowut123 wrote:

no that would be too much work

BUT THAT PROBLEM IS EZ TO SOLVEHYU;

DownsGameClub wrote:

sowut123 wrote:

no that would be too much work

BUT THAT PROBLEM IS EZ TO SOLVEHYU;

IMAGINE A MILLION OF THOSE EVERY DAY

has someone seriously not solved this yet?

cross multiply to get ydy = 2xdx

integrate both sides to get 0.5y^2 = x^2 + c

here c is an integration constant. it can be anything. even 5. or 17. or 0 if you're daring.

then multiply by 2: y^2 = 2x^2 + c

c is an arbitrary constant, so 2 times an arbitrary constant is still arbitrary, so it can stay as c.

now take a square root: y = ± sqrt( 2x^2 + c )

that's your answer. you can check your work. closed as resolved.

also i am a mathematics major and this was my favorite april fools' topic today. thank you for exercising my mind.

i hope someday you delve into the wonderful world of partial differential equations.

it will be a lot of fun, i promise. it's even better than this stuff.

thank you for listening.

-za-chary