Leetcode1015. 至少有 1 位重复的数字

给定正整数 

N

，返回小于等于 

N

 且具有至少 1 位重复数字的正整数。

1 <= N <= 10^9

 10^9暴力可以算出来，但太慢了

可以打表，每隔1000000记一次，a[i]记前i*1000000个数有多少符合条件

零头再暴力算就行

（这绝对不是正解）

[code]int ok(int x) {
int a[11];
for (int i = 0; i <= 9; i++) a[i] = 0;
while (x) {
if(++a[x%10] >= 2) return 1;
x /= 10;
}
return 0;
}

int a[] ={0,831430,1770950,2710470,3649990,4589510,5529030,6468550,7408070,8347590,9287110,10266950,11266950,12246790,13226630,14206470,15186310,16166150,17145990,18125830,19105670,20085510,21065350,22065350,23045190,24025030,25004870,25984710,26964550,27944390,28924230,29904070,30883910,31863750,32863750,33843590,34823430,35803270,36783110,37762950,38742790,39722630,40702470,41682310,42662150,43662150,44641990,45621830,46601670,47581510,48561350,49541190,50521030,51500870,52480710,53460550,54460550,55440390,56420230,57400070,58379910,59359750,60339590,61319430,62299270,63279110,64258950,65258950,66238790,67218630,68198470,69178310,70158150,71137990,72117830,73097670,74077510,75057350,76057350,77037190,78017030,78996870,79976710,80956550,81936390,82916230,83896070,84875910,85855750,86855750,87835590,88815430,89795270,90775110,91754950,92734790,93714630,94694470,95674310,96654150,97654150,98654150,99654150,100649110,101644070,102639030,103633990,104628950,105623910,106618870,107613830,108613830,109613830,110613830,111613830,112613830,113613830,114613830,115613830,116613830,117613830,118608790,119608790,120608790,121603750,122598710,123593670,124588630,125583590,126578550,127573510,128568470,129568470,130563430,131563430,132558390,133553350,134548310,135543270,136538230,137533190,138528150,139528150,140523110,141518070,142518070,143513030,144507990,145502950,146497910,147492870,148487830,149487830,150482790,151477750,152472710,153472710,154467670,155462630,156457590,157452550,158447510,159447510,160442470,161437430,162432390,163427350,164427350,165422310,166417270,167412230,168407190,169407190,170402150,171397110,172392070,173387030,174381990,175381990,176376950,177371910,178366870,179366870,180361830,181356790,182351750,183346710,184341670,185336630,186336630,187331590,188326550,189326550,190321510,191316470,192311430,193306390,194301350,195296310,196291270,197291270,198291270,199286230,200286230,201281190,202276150,203271110,204266070,205261030,206255990,207250950,208245910,209245910,210245910,211240870,212235830,213230790,214225750,215220710,216215670,217210630,218210630,219210630,220210630,221210630,222210630,223210630,224210630,225210630,226210630,227210630,228205590,229200550,230200550,231200550,232195510,233190470,234185430,235180390,236175350,237170310,238165270,239160230,240160230,241155190,242155190,243150150,244145110,245140070,246135030,247129990,248124950,249119910,250119910,251114870,252109830,253109830,254104790,255099750,256094710,257089670,258084630,259079590,260079590,261074550,262069510,263064470,264064470,265059430,266054390,267049350,268044310,269039270,270039270,271034230,272029190,273024150,274019110,275019110,276014070,277009030,278003990,278998950,279998950,280993910,281988870,282983830,283978790,284973750,285973750,286968710,287963670,288958630,289958630,290953590,291948550,292943510,293938470,294933430,295928390,296928390,297928390,298923350,299918310,300918310,301913270,302908230,303903190,304898150,305893110,306888070,307883030,308883030,309877990,310877990,311872950,312867910,313862870,314857830,315852790,316847750,317842710,318837670,319837670,320837670,321832630,322827590,323822550,324817510,325812470,326807430,327807430,328807430,329807430,330807430,331807430,332807430,333807430,334807430,335807430,336807430,337802390,338797350,339792310,340792310,341792310,342787270,343782230,344777190,345772150,346767110,347762070,348757030,349751990,350751990,351746950,352746950,353741910,354736870,355731830,356726790,357721750,358716710,359711670,360711670,361706630,362701590,363701590,364696550,365691510,366686470,367681430,368676390,369671350,370671350,371666310,372661270,373656230,374656230,375651190,376646150,377641110,378636070,379631030,380631030,381625990,382620950,383615910,384610870,385610870,386605830,387600790,388595750,389590710,390590710,391585670,392580630,393575590,394570550,395565510,396565510,397565510,398560470,399555430,400550390,401550390,402545350,403540310,404535270,405530230,406525190,407520150,408520150,409515110,410510070,411510070,412505030,413499990,414494950,415489910,416484870,417479830,418474790,419474790,420469750,421469750,422464710,423459670,424454630,425449590,426444550,427439510,428434470,429429430,430429430,431429430,432424390,433419350,434414310,435409270,436404230,437404230,438404230,439404230,440404230,441404230,442404230,443404230,444404230,445404230,446404230,447399190,448394150,449389110,450384070,451384070,452384070,453379030,454373990,455368950,456363910,457358870,458353830,459348790,460343750,461343750,462338710,463338710,464333670,465328630,466323590,467318550,468313510,469308470,470303430,471303430,472298390,473293350,474293350,475288310,476283270,477278230,478273190,479268150,480263110,481263110,482258070,483253030,484247990,485247990,486242950,487237910,488232870,489227830,490222790,491222790,492217750,493212710,494207670,495202630,496202630,497202630,498197590,499192550,500187510,501182470,502182470,503177430,504172390,505167350,506162310,507157270,508157270,509152230,510147190,511142150,512142150,513137110,514132070,515127030,516121990,517116950,518111910,519111910,520106870,521101830,522101830,523096790,524091750,525086710,526081670,527076630,528071590,529066550,530066550,531061510,532061510,533056470,534051430,535046390,536041350,537036310,538031270,539026230,540021190,541021190,542021190,543016150,544011110,545006070,546001030,547001030,548001030,549001030,550001030,551001030,552001030,553001030,554001030,555001030,556001030,556995990,557990950,558985910,559980870,560975830,561975830,562975830,563970790,564965750,565960710,566955670,567950630,568945590,569940550,570935510,571935510,572930470,573930470,574925430,575920390,576915350,577910310,578905270,579900230,580895190,581895190,582890150,583885110,584885110,585880070,586875030,587869990,588864950,589859910,590854870,591854870,592849830,593844790,594839750,595839750,596839750,597834710,598829670,599824630,600819590,601814550,602814550,603809510,604804470,605799430,606794390,607794390,608789350,609784310,610779270,611774230,612774230,613769190,614764150,615759110,616754070,617749030,618749030,619743990,620738950,621733910,622733910,623728870,624723830,625718790,626713750,627708710,628703670,629703670,630698630,631693590,632693590,633688550,634683510,635678470,636673430,637668390,638663350,639658310,640658310,641653270,642653270,643648230,644643190,645638150,646633110,647628070,648623030,649617990,650612950,651612950,652612950,653607910,654602870,655597830,656597830,657597830,658597830,659597830,660597830,661597830,662597830,663597830,664597830,665597830,666592790,667587750,668582710,669577670,670572630,671567590,672567590,673567590,674562550,675557510,676552470,677547430,678542390,679537350,680532310,681527270,682527270,683522230,684522230,685517190,686512150,687507110,688502070,689497030,690491990,691486950,692486950,693481910,694476870,695476870,696476870,697471830,698466790,699461750,700456710,701451670,702446630,703446630,704441590,705436550,706431510,707431510,708426470,709421430,710416390,711411350,712406310,713406310,714401270,715396230,716391190,717386150,718386150,719381110,720376070,721371030,722365990,723365990,724360950,725355910,726350870,727345830,728340790,729340790,730335750,731330710,732325670,733325670,734320630,735315590,736310550,737305510,738300470,739295430,740295430,741290390,742285350,743285350,744280310,745275270,746270230,747265190,748260150,749255110,750250070,751250070,752245030,753245030,754239990,755234950,756229910,757224870,758219830,759214790,760209750,761204710,762204710,763204710,764199670,765194630,766194630,767194630,768194630,769194630,770194630,771194630,772194630,773194630,774194630,775194630,776189590,777184550,778179510,779174470,780169430,781164390,782159350,783159350,784159350,785154310,786149270,787144230,788139190,789134150,790129110,791124070,792119030,793119030,794113990,795113990,796113990,797108950,798103910,799098870,800093830,801088790,802083750,803078710,804078710,805073670,806068630,807068630,808063590,809058550,810053510,811048470,812043430,813038390,814038390,815033350,816028310,817023270,818023270,819018230,820013190,821008150,822003110,822998070,823998070,824993030,825987990,826982950,827977910,828977910,829972870,830967830,831962790,832957750,833957750,834952710,835947670,836942630,837937590,838932550,839932550,840927510,841922470,842917430,843917430,844912390,845907350,846902310,847897270,848892230,849887190,850887190,851882150,852877110,853877110,854872070,855867030,856861990,857856950,858851910,859846870,860841830,861841830,862836790,863836790,864831750,865826710,866821670,867816630,868811590,869806550,870801510,871796470,872796470,873796470,874791430,875791430,876791430,877791430,878791430,879791430,880791430,881791430,882791430,883791430,884791430,885786390,886781350,887776310,888771270,889766230,890761190,891756150,892751110,893751110,894751110,895751110,896746070,897741030,898735990,899730950,900725910,901720870,902715830,903710790,904710790,905705750,906705750,907700710,908695670,909690630,910685590,911680550,912675510,913670470,914670470,915665430,916660390,917660390,918655350,919650310,920645270,921640230,922635190,923630150,924630150,925625110,926620070,927615030,928615030,929609990,930604950,931599910,932594870,933589830,934589830,935584790,936579750,937574710,938569670,939569670,940564630,941559590,942554550,943549510,944549510,945544470,946539430,947534390,948529350,949524310,950524310,951519270,952514230,953509190,954509190,955504150,956499110,957494070,958489030,959483990,960478950,961478950,962473910,963468870,964468870,965463830,966458790,967453750,968448710,969443670,970438630,971433590,972433590,973428550,974428550,975423510,976418470,977413430,978408390,979403350,980398310,981393270,982388230,983388230,984388230,985388230,986388230,987388230,988388230,989388230,990388230,991388230,992388230,993388230,994388230,994388230};

class Solution {
public:
int numDupDigitsAtMostN(int N) {
int sum = a[N/1000000];

for (int i = N/1000000*1000000+1; i <= N; i++) {
sum += ok(i);
}
return sum;
}
};