BZOJ 1695 [Usaco2007 Demo]Walk the Talk 链表+数学

题意:链接

方法:乱搞

解析:

出这道题的人存心报复社会。

首先这个单词表…先上网上找这个单词表…

反正总共2265个单词。然后就考虑怎么做即可了。

刚開始我没看表，找不到怎么做，最快的方法我也仅仅是想到了类n^6的做法。

然后我就卡关辣，这关怎么过！

神犇的方法是:观察表。发现规律:

发现表中的单词最长就是4个字母。

所以我们能够考虑求1，2，3，4长度的单词数。

1的话能够直接记录，扫的时候顺带加上即可。

然后神犇说了一句话:

表中长度为4的单词前两个字母同样的单词个数不超过35个。

长度为3前一个字母同样的单词个数不超过7个。

所以直接上链表优化啊？

这种话就要求我们预处理什么呢？

预处理点（i,j）右上角字母x的出现次数。

预处理点（i,j）右上角后缀xy的出现次数。

这个怎么维护啊？

容斥原理啊，所以复杂度在26*26*nm左右，也就是4次方，能够接受。

所以我们仅仅须要枚举开头的两个字母，这是n^4的复杂度，然后再加上链表，枚举次数不超过43=(35+7)。而提取个数由于我们的预处理，变成辣O1啊。所以这种话总共的复杂度是在n^5的。

掉了一个n啊！

这不就能过了吗！

orz出题人。

单词表:

A
AA
AAA
AAAA
ABBE
ABED
ABET
ABLE
ABLY
ABUT
ACE
ACES
ACHE
ACID
ACME
ACNE
ACRE
ACT
AD
ADD
ADDS
ADO
ADS
AFAR
AFT
AGAR
AGE
AGED
AGER
AGES
AGO
AGOG
AGUE
AH
AID
AIDE
AIDS
AIL
AIM
AIMS
AIR
AIRS
AIRY
AJAR
AKIN
ALAS
ALBA
ALE
ALEE
ALGA
ALL
ALLY
ALMA
ALMS
ALOE
ALSO
ALUM
AM
AMEN
AMID
AMMO
AMOK
AMYL
AN
ANAL
AND
ANEW
ANON
ANT
ANTE
ANTI
ANTS
ANUS
ANY
APE
APED
APES
APEX
APSE
APT
AQUA
ARC
ARCH
ARCS
ARE
AREA
ARID
ARK
ARM
ARMS
ARMY
ART
ARTS
AS
ASH
ASK
ASKS
ASP
ASS
AT
ATE
ATOM
ATOP
AUNT
AURA
AUTO
AVER
AVID
AVOW
AWAY
AWE
AWED
AWL
AWLS
AWRY
AX
AXED
AXER
AXES
AXIS
AXLE
AXON
AYE
AYES
BABE
BABY
BACK
BAD
BADE
BAG
BAGS
BAH
BAIL
BAIT
BAKE
BALD
BALE
BALK
BALL
BALM
BAN
BAND
BANE
BANG
BANK
BANS
BAR
BARB
BARD
BARE
BARK
BARN
BARS
BASE
BASH
BASK
BASS
BAT
BATH
BATS
BAUD
BAWL
BAY
BAYS
BE
BEAD
BEAK
BEAM
BEAN
BEAR
BEAT
BEAU
BECK
BED
BEDS
BEE
BEEF
BEEN
BEEP
BEER
BEES
BEET
BEG
BEGS
BELL
BELT
BELY
BEND
BENT
BEST
BET
BETA
BETS
BEVY
BIAS
BIB
BIBS
BID
BIDE
BIDS
BIER
BIG
BIKE
BILE
BILK
BILL
BIN
BIND
BING
BINS
BIRD
BIT
BITE
BITS
BLAB
BLED
BLEW
BLIP
BLOB
BLOC
BLOT
BLOW
BLUE
BLUR
BOA
BOAR
BOAT
BOB
BOBS
BODE
BODY
BOG
BOGS
BOIL
BOLD
BOLL
BOLT
BOMB
BOND
BONE
BONG
BONY
BOO
BOOB
BOOK
BOOM
BOON
BOOR
BOOS
BOOT
BORE
BORN
BOSS
BOTH
BOUT
BOW
BOWL
BOWS
BOX
BOY
BOYS
BRA
BRAE
BRAG
BRAN
BRAS
BRAT
BRAY
BRED
BREW
BRIG
BRIM
BROW
BUCK
BUD
BUDS
BUFF
BUG
BUGS
BULB
BULK
BULL
BUM
BUMP
BUMS
BUN
BUNK
BUNS
BUNT
BUOY
BURL
BURN
BURP
BURY
BUS
BUSH
BUSS
BUST
BUSY
BUT
BUTT
BUY
BUYS
BUZZ
BY
BYE
BYTE
CAB
CABS
CAFE
CAGE
CAKE
CALF
CALL
CALM
CAM
CAME
CAMP
CAN
CANE
CANS
CANT
CAP
CAPE
CAPS
CAR
CARD
CARE
CARP
CARS
CART
CASE
CASH
CASK
CAST
CAT
CATS
CAVE
CAW
CEDE
CELL
CENT
CHAP
CHAR
CHAT
CHEF
CHEW
CHIC
CHIN
CHIP
CHIT
CHOP
CHUM
CITE
CITY
CLAD
CLAM
CLAN
CLAP
CLAW
CLAY
CLIP
CLOD
CLOG
CLOT
CLUB
CLUE
COAL
COAT
COAX
COCA
COCK
COCO
COD
CODE
COED
COG
COGS
COIL
COIN
COKE
COLD
COLT
COMB
COME
CON
CONE
COO
COOK
COOL
COON
COOP
COP
COPE
COPS
COPY
CORD
CORE
CORK
CORN
COST
COSY
COT
COTS
COVE
COW
COWL
COWS
COZY
CRAB
CRAG
CRAM
CREW
CRIB
CROP
CROW
CRUD
CRUX
CRY
CUB
CUBE
CUBS
CUE
CUED
CUES
CUFF
CULL
CULT
CUP
CUPS
CURB
CURD
CURE
CURL
CURS
CURT
CUSP
CUT
CUTE
CUTS
CYST
CZAR
DAD
DADS
DALE
DAM
DAME
DAMN
DAMP
DAMS
DARE
DARK
DARN
DART
DASH
DATA
DATE
DAWN
DAY
DAYS
DAZE
DEAD
DEAF
DEAL
DEAN
DEAR
DEBT
DECK
DEED
DEEM
DEEP
DEER
DEFY
DELL
DEMO
DEN
DENS
DENT
DENY
DESK
DEUS
DEW
DEWY
DIAL
DICE
DID
DIE
DIED
DIEM
DIES
DIET
DIG
DIGS
DIKE
DILL
DIM
DIME
DIMS
DIN
DINE
DING
DINT
DIP
DIPS
DIRE
DIRT
DISC
DISH
DISK
DIVE
DO
DOCK
DOE
DOER
DOES
DOG
DOGS
DOLE
DOLL
DOME
DON
DONE
DONS
DOOM
DOOR
DOPE
DOSE
DOT
DOTE
DOTS
DOVE
DOWN
DOZE
DRAB
DRAG
DRAM
DRAW
DREW
DRIP
DROP
DRUG
DRUM
DRY
DUAL
DUB
DUBS
DUCK
DUCT
DUD
DUE
DUEL
DUES
DUET
DUG
DUKE
DULL
DULY
DUMB
DUMP
DUNE
DUNG
DUNK
DUPE
DUSK
DUST
DUTY
DYAD
DYE
DYED
DYER
DYES
DYNE
EACH
EAR
EARL
EARN
EARS
EASE
EAST
EASY
EAT
EATS
EBB
EBBS
ECHO
EDDY
EDGE
EDIT
EEL
EELS
EGG
EGGS
EGO
EGOS
EKE
EKED
EKES
ELF
ELK
ELKS
ELM
ELMS
ELSE
EM
EMIT
EN
END
ENDS
ENVY
EPIC
ERA
ERAS
ERE
ERG
ERGO
ERR
ERRS
ESPY
ET
ETCH
EVEN
EVER
EVIL
EWE
EWES
EX
EXAM
EXEC
EXIT
EYE
EYED
EYER
EYES
FACE
FACT
FADE
FAG
FAGS
FAIL
FAIN
FAIR
FAKE
FALL
FAME
FAN
FANG
FANS
FAR
FARE
FARM
FAST
FAT
FATE
FATS
FAUN
FAWN
FAZE
FEAR
FEAT
FED
FEE
FEED
FEEL
FEES
FEET
FELL
FELT
FEN
FEND
FERN
FEUD
FEW
FIAT
FIB
FIEF
FIFE
FIG
FIGS
FILE
FILL
FILM
FIN
FIND
FINE
FINK
FINS
FIR
FIRE
FIRM
FISH
FIST
FIT
FITS
FIVE
FIX
FLAG
FLAK
FLAM
FLAP
FLAT
FLAW
FLAX
FLEA
FLED
FLEE
FLEW
FLEX
FLIP
FLIT
FLOG
FLOP
FLOW
FLU
FLUE
FLUX
FLY
FOAL
FOAM
FOB
FOCI
FOE
FOES
FOG
FOGS
FOGY
FOIL
FOLD
FOLK
FOND
FONT
FOOD
FOOL
FOOT
FOR
FORD
FORE
FORK
FORM
FORT
FOUL
FOUR
FOWL
FOX
FRAY
FREE
FRET
FRO
FROG
FROM
FRY
FUEL
FULL
FUME
FUN
FUND
FUNK
FUR
FURS
FURY
FUSE
FUSS
FUZZ
GAB
GAD
GAG
GAGS
GAIN
GAIT
GALE
GALL
GAME
GANG
GAP
GAPE
GAPS
GARB
GAS
GASH
GASP
GATE
GAVE
GAWK
GAY
GAZE
GEAR
GEL
GELD
GELS
GEM
GEMS
GENE
GENT
GERM
GET
GETS
GIFT
GIG
GILD
GILL
GILT
GIN
GINS
GIRD
GIRL
GIRT
GIST
GIVE
GLAD
GLEE
GLEN
GLOW
GLUE
GLUT
GNAT
GNAW
GNU
GO
GOAD
GOAL
GOAT
GOD
GODS
GOES
GOLD
GOLF
GONE
GONG
GOOD
GOOF
GORE
GORY
GOSH
GOT
GOUT
GOWN
GRAB
GRAD
GRAM
GRAY
GREW
GREY
GRID
GRIM
GRIN
GRIP
GRIT
GROW
GRUB
GULF
GULL
GULP
GUM
GUMS
GUN
GUNS
GURU
GUSH
GUST
GUT
GUTS
GUY
GUYS
GYRO
HA
HACK
HAD
HAG
HAIL
HAIR
HALE
HALF
HALL
HALT
HAM
HAMS
HAND
HANG
HAP
HARD
HARE
HARK
HARM
HARP
HART
HAS
HASH
HAT
HATE
HATS
HAUL
HAVE
HAWK
HAY
HAZE
HAZY
HE
HEAD
HEAL
HEAP
HEAR
HEAT
HECK
HEED
HEEL
HEIR
HELD
HELL
HELM
HELP
HEM
HEMP
HEMS
HEN
HENS
HER
HERB
HERD
HERE
HERO
HERS
HEW
HEWS
HEX
HEY
HI
HICK
HID
HIDE
HIGH
HIKE
HILL
HILT
HIM
HIND
HINT
HIP
HIPS
HIRE
HIS
HISS
HIT
HITS
HIVE
HOAR
HOE
HOES
HOG
HOGS
HOLD
HOLE
HOLY
HOME
HOMO
HONE
HOOD
HOOF
HOOK
HOOP
HOOT
HOP
HOPE
HOPS
HORN
HOSE
HOST
HOT
HOUR
HOW
HOWL
HUB
HUBS
HUE
HUES
HUG
HUGE
HUH
HULL
HUM
HUMP
HUMS
HUNG
HUNK
HUNT
HURL
HURT
HUSH
HUSK
HUT
HUTS
HYMN
IBEX
IBID
IBIS
ICE
ICED
ICES
ICON
ICY
IDEA
IDEM
IDLE
IDLY
IDOL
IF
ILL
ILLS
ILLY
IMP
IMPS
IN
INCH
INK
INKS
INN
INNS
INTO
ION
IONS
IOTA
IRE
IRES
IRIS
IRK
IRKS
IRON
IS
ISLE
IT
ITCH
ITEM
ITS
IVY
JAB
JABS
JACK
JADE
JAIL
JAM
JAMS
JAR
JARS
JAW
JAWS
JAY
JAZZ
JEAN
JEEP
JEER
JERK
JEST
JET
JETS
JIG
JIGS
JOB
JOBS
JOG
JOGS
JOIN
JOKE
JOLT
JOT
JOTS
JOY
JOYS
JUDO
JUG
JUGS
JUMP
JUNK
JURE
JURY
JUST
JUT
KEEL
KEEN
KEEP
KEN
KEPT
KERN
KEY
KEYS
KICK
KID
KIDS
KILL
KIN
KIND
KING
KINK
KISS
KIT
KITE
KITS
KNEE
KNEW
KNIT
KNOB
KNOT
KNOW
KUDO
LAB
LABS
LACE
LACK
LACY
LAD
LADS
LADY
LAG
LAGS
LAID
LAIN
LAIR
LAKE
LAMB
LAME
LAMP
LAND
LANE
LAP
LAPS
LARD
LARK
LASH
LASS
LAST
LATE
LAVA
LAW
LAWN
LAWS
LAX
LAY
LAYS
LAZY
LEAD
LEAF
LEAK
LEAN
LEAP
LED
LEE
LEEK
LEER
LEES
LEFT
LEG
LEGS
LEND
LENS
LENT
LESS
LEST
LET
LETS
LEVY
LEWD
LIAR
LICE
LICK
LID
LIDS
LIE
LIED
LIEN
LIES
LIEU
LIFE
LIFT
LIKE
LILY
LIMB
LIME
LIMP
LINE
LINK
LINT
LION
LIP
LIPS
LISP
LIST
LIT
LIVE
LOAD
LOAF
LOAN
LOBE
LOCI
LOCK
LOFT
LOGO
LOGS
LOIN
LONE
LONG
LOOK
LOOM
LOON
LOOP
LOOT
LORD
LORE
LOSE
LOSS
LOST
LOT
LOTS
LOUD
LOUT
LOVE
LOW
LOWS
LUCK
LULL
LUMP
LUNG
LURE
LURK
LUSH
LUST
LUTE
LYNX
LYRE
MACE
MAD
MADE
MAID
MAIL
MAIM
MAIN
MAKE
MALE
MALL
MALT
MAMA
MAN
MANE
MANY
MAP
MAPS
MARE
MARK
MART
MASH
MASK
MASS
MAST
MAT
MATE
MATH
MATS
MAUL
MAZE
ME
MEAD
MEAL
MEAN
MEAT
MEEK
MEET
MELT
MEMO
MEN
MEND
MENS
MENU
MERE
MESH
MESS
MET
META
METE
METS
MEW
MEWS
MICA
MICE
MID
MIEN
MIKE
MILD
MILE
MILK
MILL
MIND
MINE
MINI
MINK
MINT
MIRE
MISS
MIST
MIX
MOAN
MOAT
MOB
MOBS
MOCK
MODE
MOLD
MOLE
MONK
MOO
MOOD
MOOT
MOP
MOPS
MORE
MORN
MOSS
MOST
MOTH
MOVE
MOW
MOWS
MU
MUCH
MUCK
MUD
MUFF
MUG
MUGS
MULE
MULL
MUNG
MUSE
MUSH
MUSK
MUST
MUTE
MUTT
MY
MYTH
NAB
NAG
NAGS
NAIL
NAME
NAP
NAPS
NARY
NAVY
NAY
NEAR
NEAT
NECK
NEED
NEON
NEST
NET
NETS
NEW
NEWT
NEXT
NICE
NICK
NIGH
NIL
NINE
NIP
NIPS
NO
NOD
NODE
NODS
NON
NONE
NOOK
NOON
NOR
NORM
NOSE
NOT
NOTE
NOUN
NOW
NU
NUDE
NULL
NUMB
NUN
NUNS
NUT
NUTS
OAF
OAK
OAKS
OAR
OARS
OAT
OATH
OATS
OBEY
OBOE
ODD
ODDS
ODE
ODES
ODOR
OF
OFF
OFFS
OFT
OH
OHM
OIL
OILS
OILY
OKAY
OLD
OLDY
OMEN
OMIT
ON
ONCE
ONE
ONES
ONLY
ONTO
ONUS
ONYX
OOZE
OPAL
OPEN
OPT
OPTS
OPUS
OR
ORAL
ORB
ORE
ORES
ORGY
OUCH
OUR
OURS
OUST
OUT
OUTS
OVAL
OVEN
OVER
OWE
OWED
OWES
OWL
OWLS
OWN
OWNS
OX
OXEN
PACE
PACK
PACT
PAD
PADS
PAGE
PAID
PAIL
PAIN
PAIR
PAL
PALE
PALL
PALM
PALS
PAN
PANE
PANG
PANS
PANT
PAPA
PAR
PARE
PARK
PARS
PART
PASS
PAST
PAT
PATE
PATH
PATS
PAVE
PAW
PAWN
PAWS
PAY
PAYS
PEA
PEAK
PEAL
PEAR
PEAS
PEAT
PECK
PEEK
PEEL
PEEP
PEER
PEG
PEGS
PELT
PEN
PEND
PENS
PENT
PEP
PER
PERK
PEST
PET
PETS
PEW
PEWS
PHI
PI
PICA
PICK
PIE
PIER
PIES
PIG
PIGS
PIKE
PILE
PILL
PIMP
PIN
PINE
PING
PINK
PINS
PINT
PION
PIP
PIPE
PISS
PIT
PITH
PITS
PITY
PLAN
PLAY
PLEA
PLOD
PLOT
PLOW
PLOY
PLUG
PLUM
PLUS
PLY
POD
PODS
POEM
POET
POGO
POKE
POLE
POLL
POLO
POMP
POND
PONG
PONY
POOL
POOR
POP
POPS
PORE
PORK
PORT
POSE
POSH
POST
POT
POTS
POUR
POUT
POX
PRAY
PREP
PREY
PRIM
PRO
PROD
PROP
PROS
PROW
PRY
PUB
PUBS
PUFF
PUKE
PULL
PULP
PUMA
PUMP
PUN
PUNS
PUNT
PUNY
PUP
PUPA
PUPS
PURE
PURR
PUS
PUSH
PUSS
PUT
PUTS
PUTT
PYRE
QUA
QUAD
QUAY
QUIP
QUIT
QUIZ
QUO
RACE
RACK
RAFT
RAG
RAGE
RAGS
RAID
RAIL
RAIN
RAKE
RAM
RAMP
RAMS
RAN
RANG
RANK
RANT
RAP
RAPE
RAPS
RAPT
RARE
RASH
RASP
RAT
RATE
RATS
RAVE
RAW
RAY
RAYS
RAZE
RE
READ
REAL
REAM
REAP
REAR
RED
REDO
REDS
REED
REEF
REEL
REIN
RELY
REND
RENT
REST
RHO
RIB
RIBS
RICE
RICH
RID
RIDE
RIDS
RIFT
RIG
RIGS
RILL
RIM
RIME
RIMS
RIND
RING
RINK
RIOT
RIP
RIPE
RIPS
RISE
RISK
RITE
ROAD
ROAM
ROAR
ROB
ROBE
ROBS
ROCK
ROD
RODE
RODS
ROE
ROLE
ROLL
ROMP
ROOF
ROOK
ROOM
ROOT
ROPE
ROSY
ROT
ROTS
ROUT
ROVE
ROW
ROWS
RUB
RUBS
RUBY
RUDE
RUE
RUG
RUGS
RUIN
RULE
RUM
RUMP
RUN
RUNG
RUNS
RUNT
RUSH
RUST
RUT
RUTS
RYE
SACK
SAD
SAFE
SAG
SAGA
SAGE
SAGS
SAID
SAIL
SAKE
SALE
SALT
SAME
SAND
SANE
SANG
SANK
SAP
SAPS
SARI
SASH
SAT
SATE
SAVE
SAW
SAWS
SAX
SAY
SAYS
SCAB
SCAN
SCAR
SCOW
SCUD
SEA
SEAL
SEAM
SEAR
SEAS
SEAT
SECT
SEE
SEED
SEEK
SEEM
SEEN
SEEP
SEER
SEES
SELF
SELL
SEMI
SEND
SENT
SEPT
SERF
SET
SETS
SEW
SEWS
SEX
SEXY
SHAM
SHE
SHED
SHIN
SHIP
SHIT
SHOD
SHOE
SHOP
SHOT
SHOW
SHUN
SHUT
SHY
SICK
SIDE
SIFT
SIGH
SIGN
SILK
SILL
SILO
SILT
SINE
SING
SINK
SINS
SIP
SIPS
SIR
SIRE
SIRS
SIT
SITE
SITS
SITU
SIX
SIZE
SKEW
SKI
SKID
SKIM
SKIN
SKIP
SKIS
SKIT
SKY
SLAB
SLAM
SLAP
SLAT
SLAY
SLED
SLEW
SLID
SLIM
SLIP
SLIT
SLOB
SLOP
SLOT
SLOW
SLUG
SLUM
SLUR
SLY
SMOG
SMUG
SMUT
SNAG
SNAP
SNIP
SNOB
SNOW
SNUB
SNUG
SO
SOAK
SOAP
SOAR
SOB
SOBS
SOCK
SOD
SODA
SODS
SOFA
SOFT
SOIL
SOLD
SOLE
SOLO
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代码:（因单词表在上方给出，所以此处略）

#include <cstdio>
#include <string>
#include <cstring>
#include <iostream>
#include <algorithm>
#define N 35
using namespace std;
string d[2265];
int map[N][N];
int sum1[N][N][N];
int sum2[N][N][N][N];
int fuck[N][N][N][N];
int head[N][N];
int head2[N][N];
int v[N];
int v1[N][N];
int cnt,cnt2;
int n,m;
struct node
{
    int fromx,fromy,x,y,next;
}edge[2265],edge2[2265];
void init()
{
    memset(head,-1,sizeof(head));
    memset(head2,-1,sizeof(head2));
    cnt=1,cnt2=1;
}
void edgeadd(int fromx,int fromy,int to)
{
    edge[cnt].fromx=fromx,edge[cnt].fromy=fromy;
    edge[cnt].x=to;
    edge[cnt].next=head[fromx][fromy];
    head[fromx][fromy]=cnt++;
}
void edgeadd2(int fromx,int fromy,int to,int to2)
{
    edge2[cnt2].fromx=fromx,edge2[cnt2].fromy=fromy;
    edge2[cnt2].x=to,edge2[cnt2].y=to2;
    edge2[cnt2].next=head2[fromx][fromy];
    head2[fromx][fromy]=cnt2++;
}
char s[N];
int main()
{
    //此处放单词表，多背单词少刷水！！
1
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46

！！。！！。！

。！！！。！！

init(); for(int i=0;i<=2264;i++) { int len=d[i].size(); switch(len) { case 1:v[d[i][0]-'A']=1;break; case 2:v1[d[i][0]-'A'][d[i][1]-'A']=1;break; case 3:edgeadd(d[i][0]-'A',d[i][1]-'A',d[i][2]-'A');break; case 4:edgeadd2(d[i][0]-'A',d[i][1]-'A',d[i][2]-'A',d[i][3]-'A');break; } } scanf("%d%d",&n,&m); for(int i=1;i<=n;i++) { scanf("%s",s+1); for(int j=1;j<=m;j++) { map[i][j]=s[j]-'A'; } } for(int i=0;i<26;i++) { for(int j=1;j<=n;j++) { for(int k=m;k>=1;k--) { sum1[i][j][k]=sum1[i][j-1][k]+sum1[i][j][k+1]-sum1[i][j-1][k+1]+(map[j][k]==i); fuck[map[j][k]][i][j][k]=sum1[i][j][k]-(map[j][k]==i); } } } for(int i=0;i<26;i++) { for(int j=0;j<26;j++) { for(int k=1;k<=n;k++) { for(int l=m;l>=1;l--) { sum2[i][j][k][l]=sum2[i][j][k-1][l]+sum2[i][j][k][l+1]-sum2[i][j][k-1][l+1]+fuck[i][j][k][l]; } } } } int ans=0; for(int i=1;i<=n;i++) { for(int j=1;j<=m;j++) { if(v[map[i][j]])ans++; for(int x=i;x>=1;x--) { for(int y=j;y<=m;y++) { if(x==i&&y==j)continue; if(v1[map[i][j]][map[x][y]])ans++; for(int k=head[map[i][j]][map[x][y]];k!=-1;k=edge[k].next) { int to=edge[k].x; ans+=sum1[to][x][y]-(map[x][y]==to); } for(int k=head2[map[i][j]][map[x][y]];k!=-1;k=edge2[k].next) { int to=edge2[k].x; int to2=edge2[k].y; ans+=sum2[to][to2][x][y]-fuck[to][to2][x][y]; } } } } } printf("%d\n",ans); }